There is a delicate balance of nature ______ many square miles of ocean and vegetation and clean air are needed to maintain only

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问题 There is a delicate balance of nature ______ many square miles of ocean and vegetation and clean air are needed to maintain only a relatively few human beings.

选项 A、where
B、in which
C、when
D、how

答案B

解析 in which在定语从句中做状语,相当于in the balance of nature(many square miles of...)。
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