【題目】The doctor advises us to exercise ________ on hazy (霧霾) days because it may influence our health.
A.more
B.less
C.better

【答案】B
【解析】句意：醫(yī)生建議我們在霧霾天少鍛煉因為霧霾會影響健康。根據(jù)句意和常識可知，霧霾天少鍛煉，故選B。

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