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

【答案】B
【解析】句意:医生建议我们在雾霾天少锻炼因为雾霾会影响健康。根据句意和常识可知,雾霾天少锻炼,故选B。

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