The National Institute of Mental Health is conducting research to determine the psychological effects of using drugs.

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问题 The National Institute of Mental Health is conducting research to determine the psychological effects of using drugs.

选项 A、extensive
B、refined
C、prevalent
D、out-going

答案A

解析 四个选项的意思分别是extensive广泛的;refined提炼的;prevalent普遍的,流行的;out—going友好的。句意是,国家心理健康研究所正展开广泛的研究,以确定使用毒品对人的心理方面的影响。所以正确答案是A选项,如They own extensive land by the ocean.(他们拥有海边的辽阔土地)。
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