题目内容
3．Scientists are convinced of the positive effect of laughter_____physical and mental health．（ ）| A． | of | B． | in | C． | on | D． | at |
分析 科学家深信笑对于身心健康的积极效果．
解答 答案：C
解析：根据题干及所给选项分析可知，本题考查固定短语（have）…effect on"对…有…的影响"，本题答案为C选项，其余选项均无此搭配．
点评 本题考查介词及短语的辨析．做此类题目时一定要熟悉每个介词与短语的搭配，再根据题目的要求选择合适的答案．
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