【題目】The level of __________ in the river was falling.

A. populationB. prescription

C. presentationD. pollution

【答案】D

【解析】

考查名詞詞義辨析。句意：河流的污染程度在下降。A. population人口；B. prescription處方；C. presentation呈現(xiàn)，展示；D. pollution 污染。根據(jù)本句的in the river可知，河流的污染程度，故選D。

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