multiply vt. & vi. 乘; 增加 mass n. 质量; 团; 块; 大量

　　oxygen n. 氧 exhaust vt. 用尽; 耗尽

　　短语 solar system太阳系 block out挡住（光线）

　　in time及时; 终于 cheer up感到高兴; 感到振奋

　　lay eggs下蛋 now that既然

　　give birth to产生; 分娩 break out突发; 爆发

　　in one’s turn轮到某人; 接着 watch out密切注视; 当心; 提防

　　carbon dioxide二氧化碳 prevent. . . from阻止; 制止

　　重要句型 1. What it was to become was uncertain until between 4. 5 and 3. 8 billion years ago when the dust settled into a solid globe. (be to do; what-clause as the subject)

　　2. The earth became so violent that it was not clear whether the shape would last or not. (so. . . that; it is/was not+adj. +whether-clause)

　　3. What is even more important is that as the earth cooled down, water began to appear on its surface. (what-clause as the subject; that-clause as the predicative)

　　4. It was not immediately obvious that water was to be fundamental to the development of life. [it is/was (not)+adj. +that ]

　　5. So whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved. (whether-clause as the subject; depend on+whether-clause as the object)

　　功能 Instructions:

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