Unit 5 Look into Science Lesson 28 The Study of Living Things课件(共20张PPT) 冀教版九年级全一册

(共20张PPT)
Unit 5
Lesson 28
The Study of Living Things
1.学习目标
3.重点探究
2.自主学习
学习导航
5.当堂检测
6.课堂总结
4.拓展提升
新课导入
Butterflies are beautiful, what do you know about them
学习目标
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
自主学习
biology
butterfly
migrate
fantastic
completely
grandchild
female
milkweed
chemical
puzzling
n. 生物学；生物
n. 蝴蝶
v. 移居；迁徙
adj. 奇异的；了不起的;极好的
adv. 完全地
n. 孙子；孙女；外孙；外孙女
n. 雌性的动物或植物；女子
n. （植）马利筋
n. 化学物质
adj. 令人费解的
重点探究
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.
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.
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
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!
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)
Attributive clause
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 cover is green.
Attributive clause
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)
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.
Let's Do It!
2 Join the sentence to make attributive clauses.
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
Let's Do It!
拓展提升
1.Fantastic facts about the butterfly have been drawing Dr.taylor 's attention.
drawing one's attention 意为“引起某人的注意”，
与call one's attention 同义。
此处attention用作不可数名词，意为“注意，留心”。
e.g.The facts drew some people's attention.
2.Here, as many as 230 millon butterflies spend the winter.
as many as 意为“多达......”
e.g.There are many as 3000 as students in our school.
否定形式：not as/so... as...
3.Here,as many as 230 million butterflies spend the winter.
e.g. Well, I spend a lot of time watching movies.
spend:度过，花(钱/时间)
过去式和过去分词都是spent。
相关短语：spend time/money(in) doing sth.
spend time/money on sth.
spend time with sb.
4.The experiments that we did yesterday were fantastic.
that引导定语从句,关系代词that代替先行词experiments在定语从句中作did的宾语,可省略。此时,也可使用关系代词which。
【拓展】在下列情况下,关系代词只能使用that而不能使用which:
不定代词作先行词时;先行词前有序数词或形容词的最高级时;先行词中既有人也有物时;先行词前有the only, just, next等词修饰时;当主句是who/which开头的特殊疑问句时。
当堂检测
1. Dr.Chip Taylor is ____________(biology).
2. This cross word ___________(puzzling) is hard to do .
3. My mother took some ____________ (freeze) meat from the fridge.
4.He has___________(complete)forgotten the place.
5. My black hen________ (lay) an egg yesterday.
frozen
一、用括号中所给词语的适当形式填空。
biologist
puzzle
completely
laid
二、用方框中所给词或短语的适当形式填空。
1.Look!There are many　　　　 among the flowers.
2.If you　　　　 the trees, you would do harm to the environment here.
3.The flowers are　　　　 .
4.I　　　　 forgot about it.
5.The stranger　　　　policemen’s　　　　 .
butterflies
cut down
fantastic
completely
drew attention
cut down,fantastic,draw…attention,butterfly,complete
课堂总结
Unit 5
Lesson 28
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
了解并掌握定语从句的基本知识点