2. 外语
  3. It is necessary for the valuable species to______itself in order to stay in existence.

It is necessary for the valuable species to______itself in order to stay in existence.

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问题 It is necessary for the valuable species to______itself in order to stay in existence.
选项 A、infer
B、propagate
C、inject
D、jerk
答案B
解析 A项意为“推论、推测”；B项意为“繁殖、增殖”；C项意为“注射、注入”；D项意为“把……猛地一拉”。因此，B选项符合题意。
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