2. 医学
  3. This is the______in which the organism lives most effectively.

This is the______in which the organism lives most effectively.

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问题 This is the______in which the organism lives most effectively.
选项 A、optimum
B、option
C、ordeal
D、orbit
答案A
解析 句意：这是最有利于这种有机物生存的条件。optimum最适宜(条件)。option选项，选择权。ordeal严酷的考验，折磨。orbit轨道；生活常规。
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