中小学教育资源及组卷应用平台
Unit 4 Save the trees
单元小结 (
知识目录
)
学习目标：本单元谈论重要用途。能掌握描述树的单词及句式，能读懂这方面的文章。
语法目标：学习现在进行时态的用法。
听说目标：能听懂并介绍某个植物的小短文。
写作目标：学会用现在进行时态描述植树的过程。
目录
知识要点一、重点单词，短语及句式
要点1 save的用法 练习
要点2 discuss的用法 练习
要点3 thousands of用法 练习
要点4 against的用法 练习
要点5 harmful的用法 练习
要点6 produce的用法 练习
要点 7 such as和for example区别 练习
要点8 make的用法及短语 练习
要点9 because of和because的用法 练习
要点10 stop doing和stop to do的用法 练习
要点11 cut及短语的用法 练习
要点12 keep的用法 练习
要点13重点短语 13
要点14 重点句式 13
知识要点二、语法
要点1现在进行时态的用法 15
知识要点三、书面表达
要点1 话题分析 15
要点2 词汇短语积累 16
要点3句式积累 16
(
知识要点一、重点单词，短语及句。
)要点4实战演练 17
【精讲精练】
要点 1：save
save v. （a）救助; 拯救 save one’s life 挽救某人生命
（b）保存; 存盘 save money 存钱
（c）节约 save water 节约用水 save time 节省时间
【典例分析】
1.Animals are our friends. We must do our best____________ （save） them.
2.You are a great doctor. Thank you for s__________ my life.(单词拼写)
3.请你告诉我哪里能存钱好吗？（完成句子）
Could you please tell me where I can___________ ___________
【答案】1.to save 2.saving 3.save money
要点 2：discuss
discuss讨论
discussion n. 讨论；议论
discuss sth. with sb.和某人商讨某事
discussion
We had a discussion about TV shows我们就电视节目进行了讨论。
They had a serious discussion about the problem他们对这个问题进行了认真的讨论。
I had a discussion with her about the test.关于这次测试,我和她进行了讨论。
The project is under discussion.这个项目正在讨论中。
固定搭配
have a discussion about sth.就某事进行讨论
②have a discussion with sb.与某人进行讨论
③under discussion在讨论中
联想拓展
discussion是动词discuss的名词形式。有些动词后可以加词级-sion变为名词,如connect--connection, express--expression等。
Yesterday we had a discussion aboutt he new project.昨天我们就新项目进行了讨论。
【典例分析】
1.We have many ideas after the___________ （discuss）.
2.We discussed the problem for an hour.（选出可以替换画线部分的最佳选项）
A. talked about B. thought about C. learned about
3.They had a __________ (discuss) yesterday. （根据单词首字母填写合适单词）
【答案】1.discussion 讨论。名词。 2.A discuss 讨论。=talk about 3. discussion 讨论。名词。
4. After the ___________________, they decided to have a party on Sunday.
A. mirror B. grade C. character D. discussion
【答案】D
【解析】考查名词词义辨析。句意：讨论之后，他们决定星期日举行一个聚会。A. mirror意为：镜子；B. grade意为：年级；C. character意为：角色，特征；D. discussion意为：讨论。结合句意可知，答案为D。
要点3
thousands of 好几千；成千上万
thousands of，意为“好几千，成千上万”。thousand意为“一千”，用来表示不确定的数目时，thousand应变为复数，且在后面加of。
拓展：与thousand用法类似的词
Hundred (百), thousand (千), million (百万)等表示概数时，本身要用复数形式，后接“of+可数名词复数”，即“hundreds/thousands/millions +of+名词复数”，意为“数以百/千/百万计的……”。若这些数量词前有基数词，则直接用hundred /thousand/million等，不用复数形式，也不加of。
It cost me two hundred dollars.它花了我200美元
The restaurant receives hundreds of customers every day.这家饭店每天接待数以百计的顾客
【典例分析】
1.每年人们会在山上种植成千上万棵树来保护环境。
Every year trees are planted on the hills to protect the environment.
【解析】thousands of
2. It is reported that nearly _________ foreign kids joined a British boarding school last year，and a third of them came from China．
A. nine thousand B. nine thousands C. nine thousand of D. nine thousands of
【解析】A句意：据悉，去年近九千个外国孩子加入了英国寄宿学校，其中三分之一来自中国。
考查数量的表达。thousand名词，千；前面有具体数字时，后面thousand不能用复数，也不能跟of; thousands of表示约数。故选A。
3. birds have come back because the environment here becomes better and better.
A. Thousands of B. Thousand of C. Thousands D. Thousands
【解析】 A 考查数词的用法。句意:数千只鸟已经回来，因为这里的环境变得越来越好。thousands of数千的，thousand 与数词连用时使用单数，与of连用时使用复数。故选A。
4. It is reported that there are over ______ koalas dying in the disastrous wild fire broke out recently in Australia.
A. thousands of B. 8 thousands C. 8 thousands of D. 8 thousand
【解析】1. D millions of 数以百万计的。概数。 不能与具体数字连用。2.D thousands of 数以千计的。Thousand可以与具体数字连用。Thousand后面不加“s”。
要点4：against
against反对；违反
be against 反对……; be for 支持……
play against 与。。。进行比赛
fight against 与。。。进行斗争
【典例分析】
1. Most people are against the plan. （选出可以替换画线部分的最佳选项）
A. don’t agree to B. don’t believe C. don’t know
2.We use Chinese medicine to fight a__________ the disease.
3.我们必须与空气污染作斗争。 (完成句子)
We must__________ ___________ air pollution in our city.
4. 马上有一场精彩的足球赛。中国迎战韩国。(完成句子)
It is going to be an exciting football match. China _____ _____ ______ Korea.
【答案】1.A be against 反对…… 不同意。 2. against 反对，违反 3.fight against 与。。。进行斗争
4.will play against 与。。。进行比赛
要点 5：harmful
harmful 有害的
(1) harm n.& v. （故意的）伤害；损害
（2）harmless adj. 无害的
(3) be harmful to=do harm to=be bad for对……有害
【典例分析】
1.Some pests are ___________ （harmful）. They are good for human beings.
2.It will do ___________ （harmful） to us.
3.You are ___________ （harmful） her feelings.
4.Air pollution is harmful to our health.（选出可以替换画线部分的最佳选项）
A. difficult for B. good for C. bad for
5.Eating too many sweets is h__________ to your teeth.
6.吸烟对你的健康有害。(完成句子)
Smoking________ _________ ________ your health.
【答案】1.harmless 无害的 2. harm无害的 3.harming 这里动词“伤害” 4.C be harmful to=do harm to=be bad for对……有害 5.harmful 有害的 6. is harmful to=does harm to=is bad for
要点 6：produce
produce产生；生产
【同根词】
（1）product n. 产品；结果；作品
（2）production n. 生产；产量
（3）producer n. 生产商;制作人
【典例分析】
1. My father’s car is a home ___________ （produce）.
2. The ___________ （produce） should think more of the consumer.
3. They produce many beautiful toys for the children.（选出可以替换画线部分的最佳选项）
A. give B. buy C. make
4.The factory p __________ a lot of furniture every year. （根据单词首字母填写合适单词）
【解析】1. product product n. 产品；结果；作品 2. production n. 生产；产量
3. C produce产生；生产 4. produces
要点7 such as
such as意为“例如”，用来“罗列”同类人或物中的几个例子，可置于被列举的事物与前面的名词之间，但
such as后边不能用逗号。
例如：
I have many hobbies such as reading, dancing and singing.
我有很多爱好，如读书，跳舞和唱歌。
Many of the English programs are welcome, such as Follow Me, Follow Me to Science.
其中有许多英语节目很受欢迎，例如《跟我学》《跟我学科学》。
English is spoken in many countries, such as Australia, Canada and so on.
许多国家说英语，如澳大利亚加拿大等。
拓展：
for example也意为“例如”，但是强调“举例”说明，而且一般只举同类人或物中的一个作为插入语，且用逗号隔开。for example可置于句首、句中或句末。
例如：
There are many kinds of pollution, for example, noise is a kind of pollution.
有许多种污染方式，例如噪音就是一种污染。
Many students like playing computer games，for example，Mike.
许多学生喜欢玩电脑游戏，比如迈克。
【典例分析】
1. Many students have different hobbies _________________ collecting stamps, swimming, singing.
A. for example B. such as C. as D. as examples
【答案】B
【解析】句意：许多的学生都有着不同的兴趣爱好，例如收集邮票、游泳和唱歌。考查易混短语辨析。such as……：例如，比如（列举同类事物中的几个作为例子，后接名词）；for example：例如（列举同类事物中的一个作为例子，后接一个句子）；根据句尾的动名词性质。故选B。
2. 用for example, such as或like填空
1) He studies hard. _______________, he does his homework every night.
2)The boy likes vegetables, _______________ , cabbages.
3) Mary is __________ her father.
4)He can speak four languages, ____________ Chinese and English.
5) English is spoken in many countries, _____________Australia and Canada.
【答案】1.for example 2.for example 3.like 4.such as 5.such as
3. The fruit store has many kinds of fruit, apples, bananas and mangoes.
A. like B. for example C. such as D. as well as
【答案】C
【解析】【详解】句意：水果店有很多种水果，例如苹果，香蕉和芒果。like像，如同；for example例如，such as例如，as well as而且。此处举了多个表示水果的例子，故用such as。故选C。
4.Kevin likes animals, ______ monkeys and pandas.
A. so B. so as C. such as D. such
【答案】C
【解析】句意：Kevin喜欢动物，例如猴子和熊猫。so因此，所以；so as只要；such as例如，表示举例；such如此，这样。根据句意可知，这里表示举例说明Kevin喜欢的动物，故应选C。
要点 8：make
make (a) V. 制作; 创作
（b）致使 （某人做某事）
(c) 迫使 （某人做某事）
【拓展】
（1）make+ sb./ sth.+ n./adj. 使某人或某物处于……状态
（2）make sb. do sth. 使某人做某事
（3）be made of, be made from, be made in与be made up of。
①be made of+原材料，意为“由……制成”（从制成品中仍能看出原材料）。
②be made from+原材料，意为“由……制成”（从制成品中看不出原材料）。
③be made in+地点，意为“某物生产于某地”。
④be made up of+组成部分，意为“由……组成”。
【典例分析】
1.The sweater is made ______ wool, and it’s made ______ South Korea.
A. of; from B. from; in C. of; in
2. 这种油是由花生制成的。
This kind of oil _________ __________ __________ peanuts.
3. 这些花是用纸做的。
These flowers __________ __________ __________ paper.
4. 我们班由21名男生和16名女生组成。
Our class__________ __________ __________ _________ 21 boys and 16 girls.
【答案】1.C be made of (能看出原材) be made in 由。。。（某地）生产 2.is made from
3.are made of 4.is made up of
5. The scarf which is________ silk________ soft and comfortable.
A．made from; sounds B．made of; feels
C．made in; smells D．made up of; smells
【答案】句意：用丝绸做的丝巾手感柔软舒适。be made of “由……制成”，由制成品仍可看出原材料。
6．Some goods made ________ Western countries are very expensive.
A．by B．in C．from D．of
【答案】B be made in “……生产于某地”。
7. Books are made ________ paper while paper is mainly made ________ wood.
A．of; of B．from; from C．of; from D．from; of
【答案】C be made of “由……制成”，由制成品仍可看出原材料。be made from“由……制成”，制成品经过变化，看不出原材料。书是纸做的能看出原材料。故用be made of 纸是木头做的。看不出原材料，故用be made from。
要点9 because of
because of和because是同义词，都可以表示原因，但是，because的后面用句子；because of的后面用名词、代词或者动名词短语形式。例如：
I was late this morning because I missed the first bus.
我今天早上迟到是因为我没能赶上第一班公共汽车。
We couldn’t have the sports meeting last Sunday because of the rain.
我们上个星期天没能召开运动会是因为下雨了。
【典例分析】
1. 用because和because of填空。
(1) _he is ill, he is absent today.
(2)He is not at school his illness.
(3)He can’t come the heavy rain.
(4)We like physics we can learn a lot of ideas.
(5)The students didn’t need to go to school __________ ____ the storm.
【点拨】 1.because 2.because of 3. because of 4.because 5. because of
2.He was ill, so he didn’t go to school. （同义句改写）
_____________ he was ill, he didn’t go to school.
【点拨】Because
3. He couldn’t walk because his leg was broken. （同义句改写）
He couldn’t walk ____________ ________ his _________ leg.
【点拨】because of broken
4. I came back because it was raining heavily. （同义句改写）
I came back ___________ ________ the ________ rain.
【点拨】 because of heavy
5. ______ I don’t have enough money, ______ I can’t afford the car.
A. /; so B. Because; so C./; and D./; because
【点拨】A because通常用来回答why提出的问题，与so不能同时使用。
6. He didn’t go to school yesterday ____ he was ill.
A. because B. because of C. if D. so
【点拨】because 后面通常接句子，表示“原因”。Because of 接短语。
7. I didn’t go to the party not________ the weather, but _______I didn’t feel well.
A. because of; because B. because; because of
C. because; because D. because of; because of
【点拨】A句意：我没去聚会不是因为天气，而是因为我感觉不舒服。
because of 和because都表示原因，区别是前者后面接名词性短语，后者接从句。前文根据the weather可知用because of，后者根据I didn't feel well可知用because。故选A。
要点10
stop的后面可以用动词不定式也可以用动名词作宾语。stop doing表示“停止正在做的事情”；stop to do表示“停下来开始做”的意思。例如：
Now let’s stop reading. 现在咱们停止读书。
Our teacher stopped to look at the boy. 老师停下来看了看那个男孩。
（2）stop还可以构成短语stop somebody/something from doing something表示“阻止某人做某事或者阻止某事发生”。例如：
The trees and grasses can stop the wind from blowing the earth away.
树和草可以阻止风把土吹走。
【典例分析】
1.那场大雪使他未能来我们的聚会。
The heavy snow _____________ __________ __________ __________ to our party.
【答案】stopped him from going
2.The heavy rain stopped them _______ home on time.
A. return B. returning C. returned D. to return
【答案】本题考查固定短语的用法。stop sb. (from) doing sth. 意为“阻止某人做某事”，故选B。
3. You look tired, you must________.
A. stops to work B. stopped working C. stop to work D. stop working
【答案】D你看起来很累，所以你必须停止工作。故答案选D。stop doing sth.表示“停止做某事”
4. In the end, we felt tired, so we stopped ______ a rest.
A. having B. to have C. had D. have
【答案】B 最后，我们感到累，我们停下来休息。故答案选B。stop to do 表示“停下来开始做某事”
5.请停止说话，咱们开始上课。
Please _________ _____________. Let’s start the lesson.
【答案】stop speaking。stop doing sth.表示“停止做某事”
6大雨使我们踢不了球。
The heavy rain ___________ us ___________ ___________ football.
【答案】stopped from playing。stop …from 表示阻止。。。做某事。
7.我们必须阻止人们砍伐树林。
We must ___________people _____________ ____________ down trees.
【答案】stop from cutting。表示阻止。。。做某事。
要点11 cut
cut v. 砍
辨析：cut off / cut down / cut in / cut out
词 汇 例 句
cut off 切断，剪断 They have cut off the water/electricity/gas supply.
cut down 砍倒，减少 If you cut down all the trees, you will ruin the land.
cut in 插嘴 She always cut in when other people are talking.
cut out 切去，切除 The cancerous cells had to be cut out.
【典例分析】
1、完成句子
1）我已经决定减少吸烟。
I have decided to _____ my smoking.
2）他们由于欠话费被停机。
They were ______ for not paying their phone bill.
3）我们谈话时她老是插嘴
She kept _______ on our conversation.
4）人们正在砍倒太多的树木。
People are__________ too many trees.
【答案】cut down; cut off; cutting in，cutting down ，
要点12
keep的用法：
1). keep＋名词/形容词 保持……
Running is a good way to keep healthy. 跑步是保持健康的一种好方法。
2). keep＋宾语＋形容词 使……保持某种状态
We must keep the room clean. 我们必须保持这个房间干净。
3). keep (on) doing sth. 不断地做某事
I kept (on) thinking about the match in the afternoon. 我总是想着下午的比赛。
4). keep sb. doing sth. 使某人一直做某事
I kept them waiting at the gate. 我让他们在大门口一直等着。
5). keep sb./sth. from doing sth. 防止或阻止某人/物做某事
We must keep them from getting to know our plans. 我们必须设法防止他们知道我们的计划。
拓展： keep构成的短语
keep doing sth 一直做某事
keep sb/sth doing sth 使某人/某事一直做某事
keep sb from doing sth 阻止某人做某事
keep up with 跟上
keep in mind 记住
keep on 继续
【典例分析】
2. 使劲跑，别停！
Just __________ __________, don’t stop!
【答案】keep running。keep (on) doing sth. 不断地做某事
3. 我们要尽力保持卧室清洁整齐。
We should try to __________ the bedroom __________ and tidy.
【答案】keep clean 。keep＋宾语＋形容词 使……保持某种状态
4. 对不起，让你久等了。
I’m sorry for keeping you __________ for such a long time.
【答案】waiting。 keep sb. doing sth. 使某人一直做某事
5. 疾风阻止我们去上学。
The strong wind keeps us __________ __________ to school.
【答案】from going。keep sb from doing sth 阻止某人做某事
6.大雨使我们踢不了球。
The heavy rain ___________ us ___________ ___________ football.
【答案】stopped from playing。stop …from 表示阻止。。。做某事。
7. As we all know, it’s not polite to keep others_________ for a long time.
A. wait B. waited C. to wait D. waiting
【答案】D这题考查非谓语的用法：keep sb doing“让某人一直做某事”，句意是：我们都知道，让别人等
很长时间是不礼貌的。选D。
【重点短语】
1. 与……作斗争_________________ 2. 吸收_________________
3. 环顾四周_________________ 4. 由……制成_________________
5. 数以百万计的 _________________ 6. 砍伐_________________
7. 结果；因此_________________ 8. 处于危险中_________________
9.例如_________________ 10.（补充细节）确切地说 _________________
11.玩得开心_________________ 12.考虑；思考_________________
【答案】1.fight against 2.take in 3.look around 4.(be) made of 5.millions of 6.cut down 7.as a result 8.(be) in danger 9.for example 10.in fact 11.have fun 12.think about
【重点句式】
1. 对我们来说，保护树木是重要的。
【答案】It is important for us to protect trees
2.树木可以美化环境，保持空气的凉爽和干净，对健康有好处。
【答案】Trees can keep the air cool and clean , they can make our environment more beautiful and keep us stay healthy.
3. 我们应该多种点树。树木可以从空气中吸收有害气体，产生氧气。
【答案】We should plant more trees. trees can take in harmful gases and keep the air fresh.
4. 我们应该多种点树。
【答案】We should plant more trees.
5.我们一定要保护好树木，不能砍伐，不能在树上写字。
【答案】We should protect the trees, and we shouldn’t cut down the trees or write on them.
6. 我不能想象没有树的生活。
【答案】I can’t imagine the life without trees.
7.当我们看到周边所有的树木时，会感到更加开心。
【答案】When we see all the green trees around us, we will be happier.
8.树木可以用来制作很多东西。如：很多家具都是由木头制成的。
【答案】we can use wood to make many things. For example, much furniture is made of wood.
(
知识要点二、语法
)
现在进行时
现在进行时表示说话时正在进行的动作，或表示目前一段时间内正在进行的活动。与现在进行时连用的时间状语主要有now, these days, at present, at the moment等，也可以不用时间状语。
1. 现在进行时的一般结构：be+doing, be根据主语的数不同而依次选用am, is, are。
【典例分析】
1. Look! All people _______ fun at the beach.
A. has B. having C. have D. are having
【答案】D
【解析】考查现在进行时态的用法。现在进行时态：表示此时正在发生的动作。构成：be+ving。本题，Look！表示此时的情景，故用现在进行时态。选D。
2. --- Can you answer the door, Tina I ________the dishes.
--- OK, Mom.
A. do B. did C. will do D. am doing
【答案】D
【解析】考查现在进行时态的用法。现在进行时态：表示此时正在发生的动作。构成：be+ving。从上下语境中知：正在谈论正在发生的事情。故用现在进行时态。选D。
3.Where's Tom His mother ________ him now.
A. is looking for B. will look for C. has looked for D. looks for
【答案】A
【解析】考查现在进行时态的用法。现在进行时态：表示此时正在发生的动作。构成：be+ving。从上下语境中知：正在谈论正在发生的事情。故用现在进行时态。选A。
4.-- ________ your parents ______ TV now
--- Yes. They are in the living room.
A. Did; watch B. Are; watching C. Will; watch D. Is; watch
【答案】B
【解析】考查现在进行时态的用法。现在进行时态：表示此时正在发生的动作。构成：be+ving。一般疑问句将be动词提到句前。故答案选B。
5.--- Millie, where is Miss Li
--- She _______a speech on Chinese art to the first-year students in the hall.
A. gives B. gave C. is giving D. has given
【答案】C
【解析】考查现在进行时态的用法。现在进行时态：表示此时正在发生的动作。构成：be+ving。从上下语境中知：正在谈论正在发生的事情。故用现在进行时态。选C
二、用所给单词的适当形式填空
1. Listen! The girls ______________ (read) in the classroom.
2. What ________ your grandma ________ (cook) now
4. Rebecca ________________ (not water) the flowers in the garden now.
5.Sandra is tired. She __________ （want）to go home now.
6. Have a try! This dish __________ (taste) really delicious
7. My parents _____________（teach）me English now.
8. Mr. Smith ____________ (teach) us last year.
9. Miss Brown _____________ (teach) the girls to dance tomorrow.
10. Molly often ___________ (teach) her little brother to play table tennis after school.
【答案】1.are reading 2.is cooking 3.isn’t watering 4.isn’t watering 5.wants (想要，这些动词一般没有现在进行时态，我们用一般现在时作为替代。believe hear like prefer smell understand hate know love see taste want ) 6.tastes（用法见5） 7. is teaching 8.taught 9.will teach 10.teaches
(
知识要点三、书面表达
)
【话题分析】
本单元的话题是“Save the trees”，介绍的树在我们生活中的重要作用。让我们加深保护树林的重要性。而本单元的写作部分则是根据提供信息，用进行时态完成一段植树的过程。
【短语积累】
1. 与……作斗争_________________ 2. 吸收_________________
3. 来自 _________________ 4. 环顾四周_________________
5. 失去家园 _________________ 6. 砍伐_________________
7. 结果；因此_________________ 8. 处于危险中_________________
9.是……的家园_________________ 10.对……有用，有好处_________________
11.玩得开心_________________ 12.考虑；思考_________________
13.为某人提供某物 _________________ 14.树的重要性_________________
15. 一个主要的问题_________________ 16.保持凉爽 _________________
【答案】1.fight against 2.take in 3.come from 4.look around 5.lose one’s home 6.cut down 7.as a result 8.(be) in danger1 9.be home to ... 10.(be) good for 11.have fun 12.think about 13.provide sth. for sb./provide sb. with sth. 14.the importance of trees 15. a major problem 16.keep cool
【句式积累】
1. 对我们来说，保护树木是重要的。
【答案】It is important for us to protect trees
2.树木可以美化环境，保持空气的凉爽和干净，对健康有好处。
【答案】Trees can keep the air cool and clean , they can make our environment more beautiful and keep us stay healthy.
3. 我们应该多种点树。树木可以从空气中吸收有害气体，产生氧气。
【答案】We should plant more trees. trees can take in harmful gases and keep the air fresh.
4. 我不能想象没有树的生活。
【答案】I can’t imagine the life without trees.
5.树木可以用来制作很多东西。如：很多家具都是由木头制成的。
【答案】we can use wood to make many things. For example, much furniture is made of wood.
【实战演练】
话题四
请以“Trees are important”为题，根据表格中的提示写一篇80词左右的短文，说明树木对于人类的重要性。开头已给出，但不计入总词数
树木的用途 1.树木可以美化环境，保持空气的凉爽和干净，对健康有好处。 2.树木可以从空气中吸收有害气体，产生氧气。 3.树木帮助与污染作斗争。 4.树木可以用来制作很多东西。如：很多家具都是由木头制成的。 5.树木给人类提供食物，如各种水果等。
应采取的措施 1.我们应该保护树木，严禁乱砍滥伐。 2. 其他？（至少补充一点）
___________________________________________________________________________________________
___________________________________________________________________________________________
___________________________________________________________________________________________
___________________________________________________________________________________________
___________________________________________________________________________________________
___________________________________________________________________________________________
___________________________________________________________________________________________
___________________________________________________________________________________________
___________________________________________________________________________________________
___________________________________________________________________________________________
___________________________________________________________________________________________
【参考范文】
Trees are important
Trees are the biggest and oldest living things on Earth. They are very important for human beings and animals.
Trees are very useful. First, trees can keep the air cool and clean , they can make our environment more beautiful and keep us stay healthy. Second, trees can take in harmful gases and keep the air fresh. Third, trees help fight against the pollution. Fourth, the trunk and branches provide us with wood so we can use wood to make many things. For example, much furniture is made of wood. Finally, trees can provide us with some food, such as fruit.
In short, trees are really helpful to us in many different ways. So it’s important for us to protect trees. First , we should stop cutting down so many trees and do our best to plant more trees. Second, we had better use the both sides of the paper so that we can save wood.
21世纪教育网 www.21cnjy.com 精品试卷·第 2 页 （共 2 页）
21世纪教育网(www.21cnjy.com)中小学教育资源及组卷应用平台
Unit 4 Save the trees
单元小结 (
知识目录
)
学习目标：本单元谈论重要用途。能掌握描述树的单词及句式，能读懂这方面的文章。
语法目标：学习现在进行时态的用法。
听说目标：能听懂并介绍某个植物的小短文。
写作目标：学会用现在进行时态描述植树的过程。
目录
知识要点一、重点单词，短语及句式
要点1 save的用法 练习
要点2 discuss的用法 练习
要点3 thousands of用法 练习
要点4 against的用法 练习
要点5 harmful的用法 练习
要点6 produce的用法 练习
要点 7 such as和for example区别 练习
要点8 make的用法及短语 练习
要点9 because of和because的用法 练习
要点10 stop doing和stop to do的用法 练习
要点11 cut及短语的用法 练习
要点12 keep的用法 练习
要点13重点短语 11
要点14 重点句式 12
知识要点二、语法
要点1现在进行时态的用法 12
知识要点三、书面表达
要点1 话题分析 13
要点2 词汇短语积累 14
要点3句式积累 14
要点4实战演练 15
(
知识要点一、重点单词，短语及句。
)
【精讲精练】
要点 1：save
save v. （a）救助; 拯救 save one’s life 挽救某人生命
（b）保存; 存盘 save money 存钱
（c）节约 save water 节约用水 save time 节省时间
【典例分析】
1.Animals are our friends. We must do our best____________ （save） them.
2.You are a great doctor. Thank you for s__________ my life.(单词拼写)
3.请你告诉我哪里能存钱好吗？（完成句子）
Could you please tell me where I can___________ ___________
要点 2：discuss
discuss讨论
discussion n. 讨论；议论
discuss sth. with sb.和某人商讨某事
discussion
We had a discussion about TV shows我们就电视节目进行了讨论。
They had a serious discussion about the problem他们对这个问题进行了认真的讨论。
I had a discussion with her about the test.关于这次测试,我和她进行了讨论。
The project is under discussion.这个项目正在讨论中。
固定搭配
have a discussion about sth.就某事进行讨论
②have a discussion with sb.与某人进行讨论
③under discussion在讨论中
联想拓展
discussion是动词discuss的名词形式。有些动词后可以加词级-sion变为名词,如connect--connection, express--expression等。
Yesterday we had a discussion aboutt he new project.昨天我们就新项目进行了讨论。
【典例分析】
1.We have many ideas after the___________ （discuss）.
2.We discussed the problem for an hour.（选出可以替换画线部分的最佳选项）
A. talked about B. thought about C. learned about
3.They had a __________ (discuss) yesterday. （根据单词首字母填写合适单词）
4. After the ___________________, they decided to have a party on Sunday.
A. mirror B. grade C. character D. discussion
要点3
thousands of 好几千；成千上万
thousands of，意为“好几千，成千上万”。thousand意为“一千”，用来表示不确定的数目时，thousand应变为复数，且在后面加of。
拓展：与thousand用法类似的词
Hundred (百), thousand (千), million (百万)等表示概数时，本身要用复数形式，后接“of+可数名词复数”，即“hundreds/thousands/millions +of+名词复数”，意为“数以百/千/百万计的……”。若这些数量词前有基数词，则直接用hundred /thousand/million等，不用复数形式，也不加of。
It cost me two hundred dollars.它花了我200美元
The restaurant receives hundreds of customers every day.这家饭店每天接待数以百计的顾客
【典例分析】
1.每年人们会在山上种植成千上万棵树来保护环境。
Every year trees are planted on the hills to protect the environment.
2. It is reported that nearly _________ foreign kids joined a British boarding school last year，and a third of them came from China．
A. nine thousand B. nine thousands C. nine thousand of D. nine thousands of
3. birds have come back because the environment here becomes better and better.
A. Thousands of B. Thousand of C. Thousands D. Thousands
4. It is reported that there are over ______ koalas dying in the disastrous wild fire broke out recently in Australia.
A. thousands of B. 8 thousands C. 8 thousands of D. 8 thousand
要点4：against
against反对；违反
be against 反对……; be for 支持……
play against 与。。。进行比赛
fight against 与。。。进行斗争
【典例分析】
1. Most people are against the plan. （选出可以替换画线部分的最佳选项）
A. don’t agree to B. don’t believe C. don’t know
2.We use Chinese medicine to fight a__________ the disease.
3.我们必须与空气污染作斗争。 (完成句子)
We must__________ ___________ air pollution in our city.
4. 马上有一场精彩的足球赛。中国迎战韩国。(完成句子)
It is going to be an exciting football match. China _____ _____ ______ Korea.
要点 5：harmful
harmful 有害的
(1) harm n.& v. （故意的）伤害；损害
（2）harmless adj. 无害的
(3) be harmful to=do harm to=be bad for对……有害
【典例分析】
1.Some pests are ___________ （harmful）. They are good for human beings.
2.It will do ___________ （harmful） to us.
3.You are ___________ （harmful） her feelings.
4.Air pollution is harmful to our health.（选出可以替换画线部分的最佳选项）
A. difficult for B. good for C. bad for
5.Eating too many sweets is h__________ to your teeth.
6.吸烟对你的健康有害。(完成句子)
Smoking________ _________ ________ your health.
要点 6：produce
produce产生；生产
【同根词】
（1）product n. 产品；结果；作品
（2）production n. 生产；产量
（3）producer n. 生产商;制作人
【典例分析】
1. My father’s car is a home ___________ （produce）.
2. The ___________ （produce） should think more of the consumer.
3. They produce many beautiful toys for the children.（选出可以替换画线部分的最佳选项）
A. give B. buy C. make
4.The factory p __________ a lot of furniture every year. （根据单词首字母填写合适单词）
要点7 such as
such as意为“例如”，用来“罗列”同类人或物中的几个例子，可置于被列举的事物与前面的名词之间，但
such as后边不能用逗号。
例如：
I have many hobbies such as reading, dancing and singing.
我有很多爱好，如读书，跳舞和唱歌。
Many of the English programs are welcome, such as Follow Me, Follow Me to Science.
其中有许多英语节目很受欢迎，例如《跟我学》《跟我学科学》。
English is spoken in many countries, such as Australia, Canada and so on.
许多国家说英语，如澳大利亚加拿大等。
拓展：
for example也意为“例如”，但是强调“举例”说明，而且一般只举同类人或物中的一个作为插入语，且用逗号隔开。for example可置于句首、句中或句末。
例如：
There are many kinds of pollution, for example, noise is a kind of pollution.
有许多种污染方式，例如噪音就是一种污染。
Many students like playing computer games，for example，Mike.
许多学生喜欢玩电脑游戏，比如迈克。
【典例分析】
1. Many students have different hobbies _________________ collecting stamps, swimming, singing.
A. for example B. such as C. as D. as examples
2. 用for example, such as或like填空
1) He studies hard. _______________, he does his homework every night.
2)The boy likes vegetables, _______________ , cabbages.
3) Mary is __________ her father.
4)He can speak four languages, ____________ Chinese and English.
5) English is spoken in many countries, _____________Australia and Canada.
3. The fruit store has many kinds of fruit, apples, bananas and mangoes.
A. like B. for example C. such as D. as well as
4.Kevin likes animals, ______ monkeys and pandas.
A. so B. so as C. such as D. such
要点 8：make
make (a) V. 制作; 创作
（b）致使 （某人做某事）
(c) 迫使 （某人做某事）
【拓展】
（1）make+ sb./ sth.+ n./adj. 使某人或某物处于……状态
（2）make sb. do sth. 使某人做某事
（3）be made of, be made from, be made in与be made up of。
①be made of+原材料，意为“由……制成”（从制成品中仍能看出原材料）。
②be made from+原材料，意为“由……制成”（从制成品中看不出原材料）。
③be made in+地点，意为“某物生产于某地”。
④be made up of+组成部分，意为“由……组成”。
【典例分析】
1.The sweater is made ______ wool, and it’s made ______ South Korea.
A. of; from B. from; in C. of; in
2. 这种油是由花生制成的。
This kind of oil _________ __________ __________ peanuts.
3. 这些花是用纸做的。
These flowers __________ __________ __________ paper.
4. 我们班由21名男生和16名女生组成。
Our class__________ __________ __________ _________ 21 boys and 16 girls.
5. The scarf which is________ silk________ soft and comfortable.
A．made from; sounds B．made of; feels
C．made in; smells D．made up of; smells
6．Some goods made ________ Western countries are very expensive.
A．by B．in C．from D．of
7. Books are made ________ paper while paper is mainly made ________ wood.
A．of; of B．from; from C．of; from D．from; of
要点9 because of
because of和because是同义词，都可以表示原因，但是，because的后面用句子；because of的后面用名词、代词或者动名词短语形式。例如：
I was late this morning because I missed the first bus.
我今天早上迟到是因为我没能赶上第一班公共汽车。
We couldn’t have the sports meeting last Sunday because of the rain.
我们上个星期天没能召开运动会是因为下雨了。
【典例分析】
1. 用because和because of填空。
(1) _he is ill, he is absent today.
(2)He is not at school his illness.
(3)He can’t come the heavy rain.
(4)We like physics we can learn a lot of ideas.
(5)The students didn’t need to go to school __________ ____ the storm.
2.He was ill, so he didn’t go to school. （同义句改写）
_____________ he was ill, he didn’t go to school.
3. He couldn’t walk because his leg was broken. （同义句改写）
He couldn’t walk ____________ ________ his _________ leg.
4. I came back because it was raining heavily. （同义句改写）
I came back ___________ ________ the ________ rain.
5. ______ I don’t have enough money, ______ I can’t afford the car.
A. /; so B. Because; so C./; and D./; because
6. He didn’t go to school yesterday ____ he was ill.
A. because B. because of C. if D. so
7. I didn’t go to the party not________ the weather, but _______I didn’t feel well.
A. because of; because B. because; because of
C. because; because D. because of; because of
要点10
stop的后面可以用动词不定式也可以用动名词作宾语。stop doing表示“停止正在做的事情”；stop to do表示“停下来开始做”的意思。例如：
Now let’s stop reading. 现在咱们停止读书。
Our teacher stopped to look at the boy. 老师停下来看了看那个男孩。
（2）stop还可以构成短语stop somebody/something from doing something表示“阻止某人做某事或者阻止某事发生”。例如：
The trees and grasses can stop the wind from blowing the earth away.
树和草可以阻止风把土吹走。
【典例分析】
1.那场大雪使他未能来我们的聚会。
The heavy snow _____________ __________ __________ __________ to our party.
2.The heavy rain stopped them _______ home on time.
A. return B. returning C. returned D. to return
3. You look tired, you must________.
A. stops to work B. stopped working C. stop to work D. stop working
4. In the end, we felt tired, so we stopped ______ a rest.
A. having B. to have C. had D. have
5.请停止说话，咱们开始上课。
Please _________ _____________. Let’s start the lesson.
6大雨使我们踢不了球。
The heavy rain ___________ us ___________ ___________ football.
7.我们必须阻止人们砍伐树林。
We must ___________people _____________ ____________ down trees.
要点11 cut
cut v. 砍
辨析：cut off / cut down / cut in / cut out
词 汇 例 句
cut off 切断，剪断 They have cut off the water/electricity/gas supply.
cut down 砍倒，减少 If you cut down all the trees, you will ruin the land.
cut in 插嘴 She always cut in when other people are talking.
cut out 切去，切除 The cancerous cells had to be cut out.
【典例分析】
1、完成句子
1）我已经决定减少吸烟。
I have decided to _____ my smoking.
2）他们由于欠话费被停机。
They were ______ for not paying their phone bill.
3）我们谈话时她老是插嘴
She kept _______ on our conversation.
4）人们正在砍倒太多的树木。
People are__________ too many trees.
要点12
keep的用法：
1). keep＋名词/形容词 保持……
Running is a good way to keep healthy. 跑步是保持健康的一种好方法。
2). keep＋宾语＋形容词 使……保持某种状态
We must keep the room clean. 我们必须保持这个房间干净。
3). keep (on) doing sth. 不断地做某事
I kept (on) thinking about the match in the afternoon. 我总是想着下午的比赛。
4). keep sb. doing sth. 使某人一直做某事
I kept them waiting at the gate. 我让他们在大门口一直等着。
5). keep sb./sth. from doing sth. 防止或阻止某人/物做某事
We must keep them from getting to know our plans. 我们必须设法防止他们知道我们的计划。
拓展： keep构成的短语
keep doing sth 一直做某事
keep sb/sth doing sth 使某人/某事一直做某事
keep sb from doing sth 阻止某人做某事
keep up with 跟上
keep in mind 记住
keep on 继续
【典例分析】
2. 使劲跑，别停！
Just __________ __________, don’t stop!
3. 我们要尽力保持卧室清洁整齐。
We should try to __________ the bedroom __________ and tidy.
4. 对不起，让你久等了。
I’m sorry for keeping you __________ for such a long time.
5. 疾风阻止我们去上学。
The strong wind keeps us __________ __________ to school.
6.大雨使我们踢不了球。
The heavy rain ___________ us ___________ ___________ football.
7. As we all know, it’s not polite to keep others_________ for a long time.
A. wait B. waited C. to wait D. waiting
【重点短语】
1. 与……作斗争_________________ 2. 吸收_________________
3. 环顾四周_________________ 4. 由……制成_________________
5. 数以百万计的 _________________ 6. 砍伐_________________
7. 结果；因此_________________ 8. 处于危险中_________________
9.例如_________________ 10.（补充细节）确切地说 _________________
11.玩得开心_________________ 12.考虑；思考_________________
【重点句式】
1. 对我们来说，保护树木是重要的。
2.树木可以美化环境，保持空气的凉爽和干净，对健康有好处。
3. 我们应该多种点树。树木可以从空气中吸收有害气体，产生氧气。
4. 我们应该多种点树。
5.我们一定要保护好树木，不能砍伐，不能在树上写字。
6. 我不能想象没有树的生活。
7.当我们看到周边所有的树木时，会感到更加开心。
8.树木可以用来制作很多东西。如：很多家具都是由木头制成的。
(
知识要点二、语法
)
现在进行时
现在进行时表示说话时正在进行的动作，或表示目前一段时间内正在进行的活动。与现在进行时连用的时间状语主要有now, these days, at present, at the moment等，也可以不用时间状语。
1. 现在进行时的一般结构：be+doing, be根据主语的数不同而依次选用am, is, are。
【典例分析】
1. Look! All people _______ fun at the beach.
A. has B. having C. have D. are having
2. --- Can you answer the door, Tina I ________the dishes.
--- OK, Mom.
A. do B. did C. will do D. am doing
3.Where's Tom His mother ________ him now.
A. is looking for B. will look for C. has looked for D. looks for
4.-- ________ your parents ______ TV now
--- Yes. They are in the living room.
A. Did; watch B. Are; watching C. Will; watch D. Is; watch
5.--- Millie, where is Miss Li
--- She _______a speech on Chinese art to the first-year students in the hall.
A. gives B. gave C. is giving D. has given
二、用所给单词的适当形式填空
1. Listen! The girls ______________ (read) in the classroom.
2. What ________ your grandma ________ (cook) now
4. Rebecca ________________ (not water) the flowers in the garden now.
5.Sandra is tired. She __________ （want）to go home now.
6. Have a try! This dish __________ (taste) really delicious
7. My parents _____________（teach）me English now.
8. Mr. Smith ____________ (teach) us last year.
9. Miss Brown _____________ (teach) the girls to dance tomorrow.
10. Molly often ___________ (teach) her little brother to play table tennis after school.
(
知识要点三、书面表达
)
【话题分析】
本单元的话题是“Save the trees”，介绍的树在我们生活中的重要作用。让我们加深保护树林的重要性。而本单元的写作部分则是根据提供信息，用进行时态完成一段植树的过程。
【短语积累】
1. 与……作斗争_________________ 2. 吸收_________________
3. 来自 _________________ 4. 环顾四周_________________
5. 失去家园 _________________ 6. 砍伐_________________
7. 结果；因此_________________ 8. 处于危险中_________________
9.是……的家园_________________ 10.对……有用，有好处_________________
11.玩得开心_________________ 12.考虑；思考_________________
13.为某人提供某物 _________________ 14.树的重要性_________________
15. 一个主要的问题_________________ 16.保持凉爽 _________________
【句式积累】
1. 对我们来说，保护树木是重要的。
2.树木可以美化环境，保持空气的凉爽和干净，对健康有好处。
3. 我们应该多种点树。树木可以从空气中吸收有害气体，产生氧气。
4. 我不能想象没有树的生活。
5.树木可以用来制作很多东西。如：很多家具都是由木头制成的。
【实战演练】
话题四
请以“Trees are important”为题，根据表格中的提示写一篇80词左右的短文，说明树木对于人类的重要性。开头已给出，但不计入总词数
树木的用途 1.树木可以美化环境，保持空气的凉爽和干净，对健康有好处。 2.树木可以从空气中吸收有害气体，产生氧气。 3.树木帮助与污染作斗争。 4.树木可以用来制作很多东西。如：很多家具都是由木头制成的。 5.树木给人类提供食物，如各种水果等。
应采取的措施 1.我们应该保护树木，严禁乱砍滥伐。 2. 其他？（至少补充一点）
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