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    22、Many people are convinced _________ the positive effect of laughter _________ both physical and mental health.

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

     

     

    22、C  

     

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    Many people are convinced _________ the positive effect of laughter _________ both physical and mental health.

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

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