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

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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