【題目】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】

考查動(dòng)詞辨析。句意：我們應(yīng)該經(jīng)常打開(kāi)窗戶(hù)，讓空氣流通，以減少疾病傳播。A. focus集中；B. respond回答；C. affect影響；D. circulate使流通，根據(jù)題意，故選D。

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