题目列表(包括答案和解析)
Scientists are convinced the positive effect of laughter physical and mental health.
A.of; at B.by; in C.of; on D.on;at
Scientists are convinced ___ the positive effect of laughter ___ physical and mental health.
A. of; at B. by; in C. of; on D. on; at
Scientists are convinced_____the positive effect of laughter_____physical and mental health.
A.of; at B.by; in C.of; on D.on;at
Scientists are convinced ___ the positive effect of laughter ___ physical and mental health.
A.of;at B.by;in
C.of;on D.on;at
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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