出卷网(Chujuan.Net)为中小学教师出题组卷参考：月考试卷、模拟试卷、期中期末试卷

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No one knows exactly 【小题1】 the earth began. However, according to a widely accepted theory, the universe began 【小题2】 a “Big Bang”. Then the dust 【小题3】(settle) into a solid globe. As the earth cooled down, water began to appear on its surface. Many 【小题4】(science) believe that it was the presence of water that allowed the earth to dissolve 【小题5】(harm) gases and acids into oceans and seas, which made it possible for life to develop.
Millions of years later, the first small plants appeared on the surface of the water. Their development 【小题6】(follow) by early shellfish, all sorts of fish, green plants and land animals. Reptiles 【小题7】(produce) young generally by laying eggs while mammals gave birth to young baby animals. Dinosaurs existed on the earth for over 140 million years before they suddenly disappeared. The reason 【小题8】 they disappeared still remains a mystery.
Finally, humans appeared and spread all over the earth. But they are putting too much carbon dioxide into the atmosphere, which prevents heat from 【小题9】(escape) from the earth into space. As a result of this, people believe the earth may become too hot to live on. So 【小题10】 life will continue on the earth will depend on how this problem can be solved.