A survey of the opinions of experts           that three hours of outdoor exercise a week is good for one’s health.
A. show                      B. shows                C. is shown

B

解析試題分析：句意：專家觀點(diǎn)的調(diào)查表明在戶外一周鍛煉三個(gè)小時(shí)對(duì)健康有好處。主語(yǔ)是第三人稱單數(shù)，和謂語(yǔ)動(dòng)詞之間事實(shí)主動(dòng)關(guān)系，故選B。
考點(diǎn)：考查動(dòng)詞的第三人稱單數(shù)的用法。

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