4.Why is the conquest of space more than a great a
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[A]Because it is full of challenges for human beings.
[B]Because it may be necessary for human beings to survive.
[C]Because it is the greatest adventure in human history.
[D]Because it is more exciting than any other adventures.
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【解析】[B]同义转换题。根据题干中关键词“morethanagreatadventure”,可以将答案锁定在文章小标题“SpaceCities”下的第五段的最后两句话,“。..morethanagreatadventure.。.maybeanecessityforsurvivalofthehumanspecies”。其中,第二句是对第一句的解释,而题支B正是该句的同义互换,所以答案选B项。其他选项在文中均未提及。
