高中英语必修3 Unit 4 Astronomy_ the science of the stars language points课件(共20张PPT)

(共20张PPT)
Unit 4 Astronomy: the science of the stars
How life began on the earth
(language points)

The earth was just a cloud of ______ after the “Big Bang”. The earth ______ loudly with fire and rock. They were ______ to produce many things, which were to make the earth’s atmosphere. As the earth cooled down, water began to appear on its surface. It allowed the earth to dissolve _____ gases. Then life began to develop.
Review the main idea of the text:
dust
exploded
in time
harmful
Small plants ______ and filled the first oceans and seas with oxygen. This encouraged the _________ of early shellfish and fish. Land animals such as insects, reptiles and dinosaurs appeared after green plants appeared. Small clever animals ______ all over the earth. They are putting _______ carbon dioxide into the atmosphere, which ______ heat from the earth into space. Whether life will continue on the earth for millions of years to come will _______ whether this problem can be solved.
multiplied
development
spread
too much
prevents
depend on
请从课文中找出以下词汇和短语
1 在太阳系中_______________
2 八大行星 _______________
3 生命的起源_______________
4 宗教与文化_______________
5 一个广泛认可的理论__________________
6 生命的演变_______________
in the solar system
eight planests
the origin of life
religion and culture
a widely accepted theory
the development of life
8 水的持续存在____________________
9 一联串的反应____________________
10 在水的表面 ____________________
11 绿色植物 ____________________
12 陆地动物 ____________________
13 二氧化碳 ____________________
14 由于、、、的原因_______________
15全球变暧 _____________________
the continued presence of water
a chain reaction
on the surface of the water
green plants
land animals
carbon dioxide
as a result of
global warming
比较Ved和Ving作定语的区别
a widely accepted theory一个广泛认可的理论
the continued presence of water水的持续存在
a developing country
a waiting room
a coming exam

发展中国家
候车室
即将到来的考试
请选择正确的词汇填空
a　_______　boy　
a _______ cup
an _______　　match
_______ leaves
a _______ bird
________ air and water
the _________ sun
broken
running
fallen
exciting
polluted
rising
flying
running
broken
exciting
fallen
flying
polluted
rising
比较as a result, as a result of…的区别
He was late as a result of the snow.
he defeated all competitors and as a result, he won the scholarship.
as a result of 表原因=because of
as a result, 表结果
He worked hard at his study. __________he passed the exam easily.
_____________his hard work, he passed the exam easily.
As a result,
As a result of
1 However, according to a widely accepted theory, the universe began with a “Big Bang”.
begin with: 起源于…;开始(做)…
（译中）The English alphabet begins with “A” and ends with “Z”.

(water , little drops of ,the first oceans, begin with )
The first oceans began with little drops of water.
(译英)海洋最初是由小水珠组成的.
比较begin with, start with, end with, end in, to begin/start with,的区别
A thousand li journey ______________the first step.
They ______ the play ______ a song.
Their long struggle _________failure.
______________, he had no money, but later he became very rich.
starts/begins with
ended
with
ended in
To begin with
2 the earth exploded loudly with fire and rock. They were in time to produce carbon, nitrogen, water vapour and other gases, which were to make the earth’s atmosphere.
be to do :必将会…命中注定…常用来表示不可避免将要发生的事。
（译中）As a young man, he didn’t know he was to win world fame later on.

（ be to do, have a major effect on , This discovery , the treatment of , heart disease ）
This discovery was to have a major effect on the treatment of heart disease.
(译英)这个发现对心脏的治疗将产生重大的影响。
比较be to do, be about to do, will , be going to do 的区别
The?football?match?_______?be?put?off?if?it?rains?tomorrow.?
The mid-term test ____________arrive.
Tom said he ____________have a long trip during the summer holiday.
The?students?were?told?that?they?_________meet?at?the?school?gate?at?2:00?the?following?afternoon.
will
is about to
was going to
were to
3 They produced young generally by laying eggs.
lay eggs: 下蛋
lay（laid；laid；laying放, 把……放在……；产卵
lie (lay; lain; lying) 躺；位于
lie (lied; lied; lying) 说谎
The naughty boy ____ to me that the hen that
____ there just now had ____ two eggs the day
before.
A. laid; laid; laid B. laid; lay; lain
C. lied; laid; lain D. lied; lay; laid
lied
lay
laid
4 …because they gave birth to young baby animals and produced milk to feed them.
give birth to: 生下；产生
（译中） She’s just given birth to a healthy baby girl.


（ latest novel , give birth to, The unforgettable experience , his ）
The unforgettable experience gave birth
to his latest novel.
（译英）这段难忘的经历促成了他最新的一
部小说的诞生。
句型转换
give birth to, bear
Lynn’s mother gave birth to him in Germany.
Lynn’s mother _____ him in Germany.
Lynn ____ _____ in Germany.
bore
was
born
5 Thus they have, in their turn, become the most important animals on the planet.
in one’s turn: 轮到某人；接着
（译中）Then, in their turn, they raised a question which caused a heated discussion.
in turn, by turns, take turns to do, in one’s turn
They went into the room ________to visit the paintings.
The couple wash dishes _________.
They ____________watch the dyke(河堤).
Now that I have finished buying, Tom, _________, should cook.
in turn
by turns
take turns to
in his turn
6 They are putting too much carbon dioxide into the atmosphere, which prevents heat from escaping from the earth into space.
prevent…（from）…:制止(防止)某人(某物)做某事=stop…（from）…=keep…from…
(译中)Nothing can prevent this plan from being carried out.


(sunbonnet, take, prevent…from…,be burn,)
We all took our sunbonnets to prevent us from being burn.
（译英）我们都带上了太阳帽防止被太阳晒伤。
课堂复习what do they mean?
give birth to solar system
bear the origin of life
lay eggs global warming
be to do as a result ,
be going to do carbon dioxide
begin with end in
to begin/start with
homework
一、完成讲义
Unit 4 Astronomy: the science of the stars
How life began on the earth (reading)课后练习题
二、准备听写课堂13个习惯表达