The gray wolf has been removed from endangered species______in some parts of the U.S.

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问题 The gray wolf has been removed from endangered species______in some parts of the U.S.

选项 A、report
B、survey
C、blocking
D、protection

答案D

解析 endangered species指的是“濒临灭绝的物种”。空格中应该填与此表达相关的名词,(A)report(报告书)和(B)survey(调查)都不符合语义要求。从语义上更适合与endangered species连接的是表示“保护”的(D)protection。
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