2. 外语
  3. An animal species becomes extinct when it couldn’t produce enough young to ____________ (与亡率保持同步).

An animal species becomes extinct when it couldn’t produce enough young to ____________ (与亡率保持同步).

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问题 An animal species becomes extinct when it couldn’t produce enough young to ____________ (与亡率保持同步).
选项
答案keep pace with the death rate
解析
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大学英语四级

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