Unit 5 Lesson 28 The Study of Living Things 课件(共20张PPT)

(共20张PPT)
Unit 5
Lesson 28
The Study of Living Things
新
课
导
入
What do you know about them
Language Goal
新知学习
课堂小结
当堂检测
学习目标
重点研讨
1.掌握单词：biology, butterfly, migrating, fantastic, grandchildren,
female, chemical
掌握短语：draw one’s attention, return to…, as many as, lay eggs
2.了解并掌握定语从句的基本知识点
3.了解关于大自然生物的知识
新知学习
课堂小结
当堂检测
学习目标
重点研讨
Dr.Chip Taylor teaches biology at a university in the United States. He studies one kind of North American butterfly. Just like a migrating bird, this butterfly travels about 4000 kilometres south in fall.Fantastic facts about the butterfly have been drawing Dr.Taylor’s attention.
新知学习
课堂小结
当堂检测
学习目标
重点研讨
In Mexico, the butterflies always return to the same small piece of forest, which is only 20 kilometres wide.Here,as many as 230 million butterflies spend the winter.They can cover some trees almost completely.The butterflies that return to the south are the great-great grandchildren of the butterflies that left for the north.When they begin to travel north in spring, the females lay eggs. They lay eggs on only one plant:milkweed.
新知学习
课堂小结
当堂检测
学习目标
重点研讨
But in Mexico, people cut down the trees that the butterflies need to rest on beacause they want more land for farming. In the United States and Canada, farmers use chemicals that kill milkweed. This worries Dr.Tayor a lot.
Now things are improving. Mexico has begun to protect parts of its forests. The United States and Canada have encouraged farmers to use less chemicals.
Scientists still don’t understand how the butterflies know when to fly south. If they are even a few days late, they will freeze. And how do all the great-great grandchildren find the same forest in Mexico every year This is both puzzling and interesting for many scientists.
There are many mysteries yet to be discovered by those interested in science. Would you like to study biology
新知学习
课堂小结
当堂检测
学习目标
重点研讨
1 Read the lesson and complete the table.
Fantastic facts about butterflies The butterflies always________to the same small piece of forest and_________the winter there.The butterflies that return to the south are the great-great grandchildren of the butterflies that left for the north.The females _______eggs on only one plant:milkweed.
Things that Dr.taylor worries about In Mexico, people cut down the trees that the butterflies need to ______on.In the U.S. and Canada,farmers use chemicals that ______milkweed.
Things that scientists can’t understand How do the butterflies know when to fly south How do the great—great grandchildren of the butterflies ______the same forest
return
spend
lay
rest
kill
find
Let's Do It!
新知学习
课堂小结
当堂检测
学习目标
重点研讨
Example:
We did some experiments yesterday. The experiments were fantastic.
The experiments that we did yesterday were fantastic.
1.I asked him to mail the letter. I wrote the letter to my cousin.
I asked him to mail the letter that/which/不填 I wrote to my cousin.
2.Yesterday I met a boy. The boy is a new member in our art club.
Yesterday I met a boy who/that is a new member in our art club.
3.Mary was carrying a bag. The bag cost her a lot of money.
Mary was carrying a bag that/which cost her a lot of money.
4.Football is a team sport. Football is popular all over the world.
Football is a team sport that/which is popular all over the world.
2 Join the sentence to make attributive clauses.
新知学习
课堂小结
当堂检测
学习目标
重点研讨
Task tips: Each group should prepare some pieces of paper and divide them into three columns. Student A writes a person's name in the first column, folds the paper and passes it to Student B. Student B writes a statement begining with“who", folds the paper and passes it to Student C. Student C must finish the sentence and read it out loud.
Example:
3 Work in groups of three to play a game.
Mr. Brown
who is a biologist
will give us a talk
A
B
C
重点研讨
课堂小结
当堂检测
学习目标
新知学习
Attributive clause
1)who, whom, that
Is he the man who/that wants to see you
(who/that在从句中作主语)
He is the man whom/ that I saw yesterday.
(whom/that在从句中作宾语)
重点研讨
课堂小结
当堂检测
学习目标
新知学习
2) whose 用来指人或物，(只用作定语, 若指物，它还可以同of which互换)
They rushed over to help the man whose car had broken down.
Please pass me the book whose (of which) cover is green.
Attributive clause
重点研讨
课堂小结
当堂检测
学习目标
新知学习
3)which, that
它们所代替的先行词是事物的名词或代词，在从句中可作主语、宾语等
A prosperity which / that had never been seen before appears in the countryside.(which / that在从句中作主语)
The package which / that you are carrying is about to come unwrapped.(which / that 在从句中作宾语)
Attributive clause
重点研讨
课堂小结
当堂检测
学习目标
新知学习
1.Fantastic facts about the butterfly have been drawing Dr. Taylor’s attention.
◆have been doing sth.是现在完成进行时,意为“一直在做某事”,表示从过去某时开始的某个动作或状态一直延续到现在,而且还在进行。常常表示动作的延续性、重复性以及感彩等。
◆draw one's attention意为“吸引某人的注意力”。
重点研讨
课堂小结
当堂检测
学习目标
新知学习
2.Here, as many as 230 million butterflies spend the winter.
◆as…as…意为“与……一样……”,两个as之间可加形容词或副词的原级;也可加“many+复数名词”,“much+不可数名词”或“形容词+a/an+单数名词”,还可以在as…as…前加twice,half等词表示前后者倍数或分数关系。as…as的否定形式为not as/so…as…。
◆spend为及物动词,意为“度过,花(钱/时间)”,常用于固定结构:spend time/money(in)doing sth.花费时间/金钱做某事;
spend time/money on sth.在某物上花费时间/金钱;
spend time with sb.和某人一起度过时光,句子的主语应为人,spend的过去式和过去分词都是spent。
重点研讨
课堂小结
当堂检测
学习目标
新知学习
3.The butterflies that return to the south are the great-great grandchildren of the butterflies that left for the north.
◆that return to the south和that left for the north都是定语从句。
◆leave for意为“动身去……”。leave意为“离开”,是位移动词,可使用现在进行时表将来;leave与表示一段时间的状语连用时,应改为be away(from)。
重点研讨
课堂小结
当堂检测
学习目标
新知学习
4.When they begin to travel north in spring,the females lay eggs.
◆本句中的travel为动词,原意是“旅游,旅行”,此处意为“迁徙”。
◆本句中的north为副词,意为“向北方”,也可说:travel to the north,此时north为名词。
◆lay eggs意为“产卵”。
【注意】　lay的过去式和过去分词为laid,现在分词为laying。
重点研讨
课堂小结
当堂检测
学习目标
新知学习
5.This is both puzzling and interesting for many scientists.
both…and…意为“……和……”,用于连接两个并列成分。both…and…连接两个并列成分作主语时,谓语动词使用复数形式。both…and…的同义词组为not only…but(also)…,意为“不仅……而且……”,反义词组为neither…nor…,意为“既不……也不……”。
6.There are many mysteries yet to be discovered by those interested in science.
interested in science表示“对科学感兴趣的”,作定语,修饰those。be interested in表示“对……感兴趣”。
课堂小结
重点研讨
当堂检测
学习目标
新知学习
Unit 5
Lesson 28
1.掌握单词：biology, butterfly, migrating, fantastic, grandchildren, female, chemical
掌握短语：draw one’s attention, return to…, as many as, lay eggs
2.了解并掌握定语从句的基本知识点
3.了解关于大自然生物的知识
当堂检测
重点研讨
课堂小结
学习目标
新知学习
一、汉译英。
1.在大学 _________________________________
2.返回 _________________________________
3.产卵 _________________________________
4.砍树 _________________________________
5.保护森林________________________________
at a university
return to
cut down the trees
protect forests
lay eggs
当堂检测
重点研讨
课堂小结
学习目标
新知学习
二、根据句意，从括号中选择正确的动词填空。
1.He _______(study/studies) one kind of North American butterfly.
2.Fantastic facts about the butterfly___________________(have been drawing/has drawn) Dr. Taylor’s attention.
3.They can_________(cover/covered) some trees almost completely.
4.The United States and Canada have encouraged farmers______(to use/use) less chemicals.
5. There are many mysteries yet to______________(be discovered/discovered) by those interested in science.
studies
have been drawing
cover
to use
be discovered