题目内容
No one knows exactly 1. the earth began, as it happened so long ago. However, according to a 2.(wide) accepted theory, the universe began 3.a “Big Bang” that threw matter in all directions.
What it was to become was 4. (certain) until between 4.5 and 3.8 billion years ago 5. the dust settled into a solid globe. The earth became so violent 6. it was not clear whether the shape would last or no.
People are 7.(put) too much carbon dioxide into the atmosphere, which prevents heat from 8.(escape) from the earth into space. As a result of this, many scientists believe the earth may become too hot to live on. So9.life will continue on the earth for millions of years to come will depend on whether this problem can be10. (solve).
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