单选题:In space, ___and equipment need many forms of protection.(  

题目内容:
In space, ___and equipment need many forms of protection.(  ) A.pilots
B.astronauts
C.engineers
D.scientists
参考答案:
答案解析:

By what means did Japan grab its large market share by the 1

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New York's American Museum of Natural History is opened rece

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According to paragraph 2, why did Stone Age tribes begin to

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