Scientists are convinced    the positive effect of laughter   physical and menta

Scientists are convinced    the positive effect of laughter   physical and menta

题型:不详难度:来源:
Scientists are convinced    the positive effect of laughter   physical and mental health.
A.of; atB.by; inC.of; onD.on; at

答案

解析
be convinced of 确信。effect on……,有关于------方面的影响。
举一反三
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A.in needB.in timeC.in preparationD.in store

题型:不详难度:| 查看答案
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-It’s a challenge, I guess, _________man against nature.  
A.ofB.forC.byD.about

题型:不详难度:| 查看答案
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-__________ September 30.
A.InB.ByC.DuringD.Within

题型:不详难度:| 查看答案
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--- Because the old one has been damaged ___________.
A.beyond reachB.beyond repair C.beyond controlD.beyond description

题型:不详难度:| 查看答案
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题型:不详难度:| 查看答案
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