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    Scientists are convinced the positive effect of laughter physical and mental health. A. of, at B. of, on C. on, at D. by, on 【查看更多】

     

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    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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    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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    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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    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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    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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