Asurveyoftheopinionsofexperts thatthreehoursofoutdoor...

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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

解析：本题考查主谓一致。主句主语是a survey，谓语动词应用单数形式；从句主语是three hours of outdoor exercise a week 表示一个整体概念，因此谓语动词也应用单数形式。