摘要:根据课文内容用适当的词填空.使短文完整. 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. 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. 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.But11.never 12.As 13.damages 14.Whether 15.to come 人教新课标必修三Unit 5

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