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Unit 4 Astronomy：the science of the stars Section ⅠWarming Up & Reading 课时精练（人教版必修3，重庆专用） Ⅰ.课文缩写 The earth was just a cloud of __1__ after the “Big Bang”．The earth __2__ loudly with fire and rock.They were in __3__ 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 __4__ gases.Then life began to develop. The first small plants __5__ and filled the oceans and seas with oxygen.This encouraged the __6__ of early shellfish and fish.Land animals such as insects，reptiles and dinosaurs and so on appeared after green plants appeared.Small clever animals __7__ all over the earth.They are putting too __8__ carbon dioxide into the atmosphere, which __9__ heat from the earth into space.Whether life will continue on the earth for millions of years to come will __10__ on whether this problem can be solved. 答案 1.dust 2.exploded 3.time 4.harmful 5.multiplied 6.development 7.spread 8.much 9.prevents 10.depend Ⅱ.单词拼写 1．He was interested in ________ (天文学)and always stayed up at night to watch the stars. 2．Computer hackers have broken down security ________(系统), raising questions about the safety of information. 3．Too much sugar can be ________(伤害)to children's teeth. | 
