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【题目】Don't release any harmful smoke into the air. The underlined part means “_______”.

A. let outB. drive awayC. clean upD. watch out

【答案】A

【解析】

句意:不要向空气释放任何有毒气体。划线部分什么意思?考查动词词组辨析。A. let out放出;B. drive away (把车)开走,赶走;C. clean up收拾干净,打扫;D. watch out当心,提防。根据后面宾语harmful smoke有毒气体。故选A

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