The animals, highly sensitive to pollution, can ______ monitor of water quality.

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问题 The animals, highly sensitive to pollution, can ______ monitor of water quality.

选项 A、serve as
B、work for
C、cope with
D、relate

答案A

解析 serve as：担任，充当；work for：为……工作，为……效力；cope with：处理，应付；relate：使有联系。根据句意可知，选A。

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