题目内容
（请给出正确答案）
[单选题]
Scientists have spent years researching into the （） of sleeping pills on the human brain .
A.affect
B.effect
C.impact
D.influence
答案
B、effect
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题目内容
（请给出正确答案）
A.affect
B.effect
C.impact
D.influence
答案
B、effect
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第9题
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