人教版必修3 Unit4 Astronomy: the science of the stars Language Points 课件 (29张PPT)

(共29张PPT)
Language Points in the
Reading Text

语言点导学
1. in time
in time (for sth. / to do sth.) = not late
The car came to a stop just in time to
prevent an accident.?
汽车及时停下，避免了一场车祸。
Can we get to the station in time??
我们能及时到达车站吗？
及时；终于
与 time 相关的短语:
in no time 立刻, 马上
at times 有时
at a time 每次; 依次
once upon a time 从前
on time 按时; 准时
at one time 从前
for the time being 暂时
from time to time 不时地
1.—Why are you in a hurry to leave here?
—Get home _______ to bathe the kid.
2.These buses are never _______ and the passengers are always complaining.
3.I am away, please call me __________ if someone come to see me.
选词填空
in time; on time; in no time; at one time; at times; at any time
in time
on time
at any time
4.You can’t imagine this lake used to be a beautiful place in our province ___________.

5.He rushed out of the kitchen ________ when he heard the shout.

6. _________ I sit silently and wonder if this kind of job is worth all the effort.
at one time
in no time
At times
2. atmosphere
The shuttle Columbia will re-enter Earth's
atmosphere tomorrow morning.
哥伦比亚号航天飞机将在明天上午重进地
球大气层。
They left the lights down to create a
comfortable atmosphere.
他们让灯光保持暗淡以创造一种舒适的气
氛。
n. 大气层；气氛
3. harmful
adj. 有害的
These harmful chemicals will do us no good.
这些有害的化学制品对我们没有好处。
It is certain that the dirty water is harmful.
毫无疑问，这些脏水是有害的。
be harmful to
对……有害
Such films will be harmful to teenagers.
这些电影会对青少年有害。
practice
用harm的适当形式填空，完成下
列各句。
As we all know, smoking is ________
to our health.
2. Often playing computer games will
do you great ______.
3. The water in this cave is so clear that
it is _________ to our health, I think.
harmful
harm
harmless
短语搜索 在课本P25~P26找出下列短语并结合语境理解其意思。
1.四面八方 _______________
2.及时 _______________
3.cool down _______________
4.dissolve harmful gases _______________
5.millions of _______________
6.出生；分娩 _______________
give birth to
in all directions
in time
冷却下来
溶解有害气体
数以百万的
7.spread all over the earth ______________
8.轮到某人 ______________
9.阻止 ______________
10.escape from…into ______________
11.as a result of ______________
12.依靠 ______________
遍布全世界
in one’s turn
prevent ...from
从……逃离到……
由于……的结果
depend on/upon
美句分析：

1. However， according to a widely accepted theory，the universe began with a “Big Bang” that threw matter in all directions.
然而，一种普遍为人们所接受的理论是:宇宙起源于一次大爆炸，这次大爆炸将物质投射到四面八方。(P25 L1)
[句型] begin with/start with 以……开始，从……着手

[仿写] 认识从实践开始。
Knowledge_________________________.
begins with practice
2.It was not immediately obvious that water was to be fundamental to the development of life.
水会对生命的发展起关键作用，这一点在当时并不太明显。(P26 L 18)
[分析] 句中it是形式主语，真正的主语是that引导的主语从句。

[仿写] 他顺利通过了考试,这一点也不奇怪。
It is no wonder_________________________.
that he has passed the exam
3. What many scientists believe is that the continued presence of water allowed the earth to dissolve harmful gases and acids into the oceans and seas. 很多科学家相信，由于地球长期有水存在，使地球得以把有害气体和酸性物质溶解在海洋里。(P26 L21)
[分析] 句中what…believe是主语从句，that引导一个表语从句。

[句型] allow sb. to do允许……做……

[仿写] 我允许她在这儿呆了一会儿。
I _________________ here for a moment.
allowed her to stay
四、难句分析
1.What it was to become was uncertain until between 4.5 and 3.8 billion years ago when the dust settled into a solid globe.(P25 L6)

[句式分析]
句中what 引导的是_________,what 在从句中作become的_____。when引导的是________,修饰between 4.5 and 3.8 billion years ago。
主语从句
表语
定语从句
[原句试译]
______________________________________
______________________________________

[仿写] 李老师明天将去北京，直到那时才能知道谁将代替她给我们上课。______________________________________
______________________________________
Who will give us lessons in place of Miss Li isn’t known until tomorrow when she will go to Beijing.
它会变成什么还没有人知道，直到38~45亿
年前，这团尘埃才慢慢地形成一个固体的球体。
2. What is even more important is that as the earth cooled down， water began to appear on its surface.(P26 L13)

［句式分析］
句中what引导的是一个__________，that引导的是一个_________，as引导的是一个_________________ 。
时间状语从句
主语从句
表语从句
［句式仿写］
很多人认为随着我们社会的发展，污染变得越来越严重。

What many people believe is that as our society develops, pollution is getting more and more serious.
3. So whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved.(P26 L 50)

［句式分析］
句中第一个whether引导一个_____从句；第二个whether引导一个_____从句。to come为不定式作后置定语修饰years。
宾语
主语
［原句试译］



［句式仿写］
我们是否去野炊取决于天气是否会变晴。
Whether we will go for a picnic will depend on whether the weather will become sunny.
所以，在未来的数百万年中，生命能否在地球上延续取决于这个问题能否得到解决。
小试牛刀
一、单词拼写 根据下列各句句意及所给单词的首字母或汉语提示，写出所缺单词的正确形式。
1.What would happen if there were no _________ (大气层).

2.Each _________ (宗教信仰) and culture has its own ideas about how life bagan on earth.
atmosphere
religion
3.Because of the _________ (到场)of the famous football star, everyone cheered up.

4.One cannot e___ without air.

5.The final cost could be as much as one b_______ dollars.
presence
exist
billion
6.There is too much________ (暴力)on TV.

7.Smoking is h_______ to health, but some people cannot get rid of it.

8.The mammals_________ (繁殖) when the animals that are harmful to them disappeared.

9.Without o______ animals can’t live.
10.They could not p_____ him from smoking.
violence
harmful
multiplied
oxygen
prevent
二、介词填空 用适当的介词填空。
1.He was late for school as a result___ snow.

2.He usually comes to school early. It’s very _____ him to be so late today.

3.A knowledge of physics is fundamental _____ any understanding of this problem.
of
unlike
to
4.A seed can grow_____ a tree, and trees make up beautiful forests.

5.Do you know that crocodiles reproduce ___ laying eggs?
into
by
Homework:
1. 记会所有单词（Unit4）；
2. 抄写课文第四段并翻译；
3.找出课文中的所有名词性从句。