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  3. There is Aa delicate balance of nature Bwhich many square miles of ocean and vegetation and clean air Care needed to maintain on

There is Aa delicate balance of nature Bwhich many square miles of ocean and vegetation and clean air Care needed to maintain on

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问题 There is Aa delicate balance of nature Bwhich many square miles of ocean and vegetation and clean air Care needed to maintain only Da relatively few human beings.
选项 A、 
B、 
C、 
D、 
答案B
解析 应改为where。
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