2. 外语
  3. Many countries have conservation programs to prevent certain ______ of fish from becoming extinct.

Many countries have conservation programs to prevent certain ______ of fish from becoming extinct.

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问题 Many countries have conservation programs to prevent certain ______ of fish from becoming extinct.
选项 A、sources
B、species
C、numbers
D、members
答案B
解析 本题考查句意和名词辨析。source“来源，资源”；species“种类”；number“数量”；member“成员”。根据句意应该是鱼的种类，故答案选B。
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