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外语
It is one thing to land science instruments on Mars. However, it is quite 【S1】______ another to establish a base for’ huma
It is one thing to land science instruments on Mars. However, it is quite 【S1】______ another to establish a base for’ huma
admin
2009-02-15
80
问题
It is one thing to land science instruments on Mars. However, it is quite 【S1】______
another to establish a base for’ humans to explore planet. Daytime temperatures 【S2】______
can be rise above freezing, but, because of the extremely thin atmosphere, 【S3】______
the sun heat radiates back into space. Even at the equator, the temperature 【S4】______
drops -50℃at night. In fact, there is no ozone (臭氧) layer to keep out 【S5】______
ultraviolet (紫外线的) radiation, and hardly some oxygen for either breathing 【S6】______
and burning conventional fuels. But despite all these problems, scientists are 【S7】______
currently working transport and clothing for Mars and an artificial environment 【S8】______
in which colonists could live. However, the potential cost make the idea of 【S9】______
human life on Mars nothing other than a fantastic dream. 【S10】______
选项
答案
science→scientific
解析
应该用形容词作定语。
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本试题收录于:
公共英语二级笔试题库公共英语(PETS)分类
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公共英语二级笔试
公共英语(PETS)
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