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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