Some scientists have suggested that Earth is a kind of zoo or wildlife ______ for intelligent space beings, like the wilderness

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问题 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.

选项 A、conservation
B、maintenance
C、storage
D、reserve’

答案D

解析
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