【题目】We should often open windows to make air _______ to decrease disease transmission.
A. focus B. respond
C. affect D. circulate
在线课程【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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