There is a delicate balance of nature______ many square miles of ocean and veget

游客2025-03-18  0

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在定语从句中作状语,相当于in the balance of nature(many square milesof…)。
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