be harmful to/do harm to
solar system
carbon dioxide
be to do
allow sb.to do sth.
be amazed at
in the atmosphere of
lay the foundation
a chain of
Ⅲ.佳句填空 1.________ was not immediately obvious that water was to be fundamental ________ the development of life. 水会对生命的发展起关键作用,这一点在当时并不太明显。 2.What it was ________(become) was uncertain ________ between 4.5 and 3.8 billion years ago ________ the dust settled into a solid globe. 它会变成什么,当时还没有人知道,直到38至45亿年前,这团尘埃才慢慢地形成一个固体的球体。 3.What is even ________(important) is that as the earth cooled down, water began to appear on
________ surface. 更为重要的是,地球冷却了下来,地球的表面就开始出现了水。 4.So ________ life will continue on the earth for millions of years ________(come) will depend on whether this problem can ________(solve). 所以,在未来的数百万年中,生命能否在地球上延续取决于这个问题能否得到解决。
5.I cheered up immediately and ________(float) weightlessly around in our spaceship cabin ________(watch) the earth become smaller and the moon ________(large). 我立刻高兴起来,由于失重,我在太空舱里飘来飘去,我望着(身后的)地球越来越小,而(前方的)月球越来越大。 答案:1.It; to 2.to become; until; when 3.more important; its 4.whether; to come; be solved 5.floated; watching; larger
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