题目内容
四川南充市2011届第二次高考适应性考试英语试题
Scientists are convinced the positive effect of laughter physical and mental health.
A.of; at B.by; in C.of; on D.on; at
C

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四川南充市2011届第二次高考适应性考试英语试题
Scientists are convinced the positive effect of laughter physical and mental health.
A.of; at B.by; in C.of; on D.on; at
C