1．The girl was________at the________scene and ran away in________.(terrify)

　根据课文内容用适当的词填空，使短文完整。(一空一词)

The earth began with a cloud of energetic dust，which slowly combined into a ball 1.________ around the sun.As the earth exploded with fire and rock，water vapour，carbon，oxygen，nitrogen and other gases 2.________ (produce) to make the earth’s atmosphere.3.________ water appearing on the earth，life began to develop first in the water in the form of small plants.These plants multiplied and filled the oceans and seas with oxygen，which made 4.________possible for early shellfish and all sorts of fish to develop.

Over many millions of years green plants began to appear on land.With the oxygen produced by the green plants，land animals，5.________insects and amphibians，came into being.When the plants grew into 6.________，reptiles appeared，7.________produced young by laying eggs.Mammals were the last group of animals，and 8.________from the previous animals，they produced their young from 9.________ their bodies.

Small but most advanced animals，now with hands and feet，appeared and spread all over the earth.They were so clever that they became the masters over the earth.10.________they aren’t taking good care of the earth and 11.________stop exploiting the resources of the earth to develop new ways of living.12.________time goes by，many 13.________have been done to the earth by them.14.________life will continue on the earth for millions of years 15.________(come) will depend on whether they will stop damaging the earth.

答案：1.moving　2.were produced　3.With　4.it　5.like/such as　6.forests　7.which　8.different　9.within　10.But

11．never　12.As　13.damages　14.Whether　15.to come

人教新课标必修三Unit 5

7. Scientists are certain that man will land on Mars in time.

[连句成篇]　We don’t know whether life exists on Mars. Whether we can land on Mars depends on the development of science and technology. Man has known a little about Mars: there is almost no oxygen on Mars and it might be about 50 degrees above zero at noon and 100 degrees below zero at night, which prevents us from living there.Now that Mars are quite different from our earth, if we are to go to Mars one day, we should have to take along our own oxygen, food, clothing and shelter. Although it seems to be only a dream to land on Mars, scientists are certain that man will land on Mars in time.

6. It seems to be only a dream to land on Mars.

5．Now that Mars are quite different from our earth，if we are to go to Mars one day，we should have to take along our own oxygen，food，clothing and shelter.

4. This prevents us from living there.

3．Man has known a little about Mars：there is almost no oxygen on Mars and it might be about 50 degrees above zero at noon and 100 degrees below zero at night.

2．Whether we can land on Mars depends on the development of science and technology.

7．科学家们却认为人类迟早会登陆火星的。(land，certain)

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答案：[句子翻译]　1. We don’t know whether life exists on Mars.