摘要： A survey of the opinions of experts that three hours of outdoor exercise a week good for one’s health. A.show; are B.shows; is C.show; is D.shows; are 答案 B 解析 本题考查主谓一致.由a survey可知第一个空用shows.首先排除A.C两项,第二个空前的时间three hours of outdoor exercise a week表示抽象概念.看作单数.故其谓语动词用单数形式.

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