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        1. Scientists are convinced _____ the positive effect of laughter _____ physical and mental health.

          A. of; at
          B. by; in
          C. of; on
          D. on; at
          相關(guān)習(xí)題

          科目:高中英語 來源: 題型:

          Scientists are convinced    the positive effect of laughter   physical and mental health.   

          A.of; at     B.by; in     C.of; on       D.on;at

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          科目:高中英語 來源: 題型:

          Scientists are convinced ___ the positive effect of laughter ___ physical and mental health.

             A. of; at      B. by; in      C. of; on     D. on; at

          查看答案和解析>>

          科目:高中英語 來源: 題型:

          Scientists are convinced_____the positive effect of laughter_____physical and mental health.     

          A.of; at     B.by; in     C.of; on       D.on;at

          查看答案和解析>>

          科目:高中英語 來源: 題型:

          Scientists are convinced ___ the positive effect of laughter ___ physical and mental health.

          A.of;at                                                            B.by;in

          C.of;on                                                           D.on;at

          查看答案和解析>>

          科目:高中英語 來源: 題型:

          Scientists are convinced    the positive effect of laughter   physical and mental health.

          A. of; at     B. by; in     C. of; on       D. on; at

          查看答案和解析>>

          科目:高中英語 來源: 題型:

          Scientists are convinced    the positive effect of laughter   physical and mental health.

             A. of; at     B. by; in     C. of; on       D. on; at

           

           

          查看答案和解析>>

          科目:高中英語 來源: 題型:

           Scientists are convinced. _______ the positive effect of laughter _______ physical and mental health.

          A. of; at                       B. by; in                C. of; on               D. on; at

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          科目:高中英語 來源:2014屆河南中原名校聯(lián)盟高三上學(xué)期第一次摸底考試英語試卷(解析版) 題型:單項填空

          Scientists are convinced ________ the positive effect of laughter ________ physical and mental health.

          A. of; at          B. on; at            C. by; in            D. of; on

           

          查看答案和解析>>

          科目:高中英語 來源:2011-2012學(xué)年遼寧省葫蘆島市五校協(xié)作體高三8月模擬考試英語題 題型:單項填空

          Scientists are convinced _______the positive effect of laughter ______ physical and mental health.

              A. of ; at       B. by ; in       C. of ; on        D. on ; at

           

          查看答案和解析>>

          科目:高中英語 來源:2007年高考試題(江西卷)解析版 題型:單項填空

           Scientists are convinced ___ the positive effect of laughter ___ physical and mental health.

          A.of;at                                 B.by;in

          C.of;on                                 D.on;at

           

          查看答案和解析>>


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