人教版英语必修三Unit 4 Reading

Unit 4 Astronomy: the science of the stars

Reading

How Life Began on the Earth

Objectives: 1. To know the origin and development of life on earth.

2. To train the students’ reading skills: skimming and scanning.

3. To stimu late students’ interest in astronomy and develop their

scientific exploration spirit.

Step I scanning

Scan the passage and then choose the best answers according to the passage.

1. Why was life able to develop on the earth but not on other planets?

A. The earth had a solid shape.

B. The earth did not have harmful gases in its atmosphere.

C. Water stayed on the earth but not on other planets.

D. The earth was not too hot and not too cold.

2. Why arc plants important on the earth?

A. They produce oxygen for animals.

B. They provide shade for animals.

C. They provide a beautiful scene.

D. They protect the soil from being destroyed.

3. What is the correct order according to the passage?

①The clever animals with hands and feet appeared and spread all over the earth.

②The “Big Bang”.

③Small plants began to appear on the surface of the water.

④65 million years ago, the age of the dinosaurs ended.

A.②①③④

B.④③①②

C.②④③①

D.②③④①

4. Early humans appeared after dinosaurs died out_______ million years later.

A.67.6

B.62.4

C.65

D.140

5. What is the main idea of the passage?

A. The formation of the earth.

B. The arrival of humans and their impact on the earth.

C. The development of plants and animals on the earth.

D. The origin of life on the earth.

Step II Careful reading

A).Read the passage carefully and analyze its structure. Write down the main idea of each paragraph.

Paragraph1

Paragraph2.

Paragraph3

Paragraph4

Paragraph5

B).Read the paragraph4 and correct the errors (10 in total)

Many millions of years later, the first extreme small plants began to appear on the surface of the water. They multiplied and filled the oceans and seas of oxygen, what encouraged the later development of early shellfish and all sorts of fish. Next, green plants began to grow on land. They were followed in time by land animals. Some were insects. Other, called amphibians, were able to live on land as well as in the water. Late when the plants grew into forests, reptiles appeared for the first time. They produced young generally by laying eggs. After that, some huge animals, calling dinosaurs, developed. They laid eggs too and existed on the earth for more than 140 million years. Therefore, 65 million years ago the age of the dinosaurs ended. Why they suddenly disappeared still remain a mystery. This disappearance made possible the rise of mammal on the earth. These animals were different from all life forms in the past, because they gave birth to young baby animals and produce milk to feed them.

C). Read the text carefully again

Fill in the blanks with proper words according to the text (not more than 3 words)。

The earth was just ______1______ cloud of dust after the “Big Bang”．The earth exploded loudly with fire and rock.______2______ were in time to produce many things，which were to make the earth’s atmosphere. As the earth cooled down，water began to appear on ______3______ surface. It allowed the earth to dissolve ______4______(harm)gases. Then life began to develop.

Small plants multiplied and filled the first oceans and seas with oxygen. This encouraged the ______5______(develop)of early shellfish and fish. Land animals such ______6______ insects，reptiles and dinosaurs appeared after green plants appeared. Small clever animals spread all ______7______ the earth. They are putting too much carbon dioxide into the atmosphere，______8______ prevents heat from escaping from the earth into space.______9______ life will continue on the earth for millions of years to come will depend on whether this problem can ______10______(solve)．

Step3 language points

1.This produced a chain reaction, which made it possible for life to develop.

这就产生了一个连锁反应，使生命的发展成为可能。

make it + adj./n.+ to do sth./that clause

她让每天早上六天起床成为一种习。

He makes _____________________________________________________________________.

他把照顾这位老人当作自己的责任。

He made_____________________ take care of the old man.

2. They are putting too much carbon dioxide into the atmosphere, which prevent heat from escaping

from the earth into space.

prevent vt. 阻止，预防prevention (n.) prevent sth.

Vitamin C is supposed to _________________________________________________________．

维生素C被认为能预防感冒。

They came______________________________________________________________________．

他们及时赶到避免了一场事故。

prevent sb. /sth. (from)doing sth. “阻止某人/某物做某事”

1)The unexpected snowstorm __________________________________(阻止了我们去登山).

2) Who prevents their plans______________________________________________?

谁阻止他们的计划被实施?

3.They were in time to produce carbon，nitrogen，water vapour and other gases，which were to make the earth’s atmosphere．(P25)最终产生了碳、氮气、水蒸气和其他多种气体，从而形成了地球的大气层。

in time : eventually 最终；及时，来得及

1).You will succeed in time as long as you don’t give up.

______________________________________________________________________

2).He braked his car just in time only to avoid an accident.

_______________________________________________________________________

4. Why they suddenly disappeared still remains a mystery P26)

它们为什么会突然灭绝至今仍是个谜。

remain link v. 保持不变，仍是remain不能用于被动结构。

remain modest and prudent保持谦虚谨慎

I went to the city，but my brother _____________________________________．

我去了城市，可弟弟留在了家里。

In spite of their quarrel，they _____________________________________________ 他们尽管吵过架，却仍不失为最好的朋友．

他是否正确仍需拭目以待。

_______________________________________________ whether he is right or not. 【拓展】remains n. 剩余物，废墟remaining adj. 剩余的(作前置定语)

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