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【单选题】
Some scientists have suggested that earth is a kind of zoo or wildlife______for intelligent space beings, like the wilderness areas we have set up on earth to allow animals to develop naturally while we observe them.
A.conservation
B.maintenance
C.storage
D.reserve
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根据网考网移动考试中心的统计,该试题:
7%
的考友选择了A选项
5%
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24%
的考友选择了C选项
64%
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