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Scientists are convinced ________the positive effect of laughter________ physical and mental          health.
A．of; atB．of; onC．by; inD．on; at
B
考查介詞辨析。be convinced of 相信… ; “對…有影響” 應用介詞on。句意：科學家們相信笑聲對身體和精神健康有積極地影響。故B正確。
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