The National Institute of Mental Health is conducting ______ research to determi

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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 (extensive广泛的)。句意为：全国精神健康研究院正在开展广泛的调查从而测定吸毒的心理影响。B．refined精炼的，精制的；C．prevalent流行的，盛行的；D．out-going开朗的。

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