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【题目】We should often open windows to make air _______ to decrease disease transmission.

A. focus B. respond

C. affect D. circulate

【答案】D

【解析】

考查动词辨析。句意:我们应该经常打开窗户,让空气流通,以减少疾病传播。A. focus集中;B. respond回答;C. affect影响;D. circulate使流通,根据题意,故选D

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