The National Institute of Mental Health is conducting a far-reaching research to determine the psychological effects of using dr

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问题 The National Institute of Mental Health is conducting a far-reaching research to determine the psychological effects of using drug.

选项 A、extensive
B、refined
C、prevalent
D、tentative

答案A

解析  画线词far-reaching:意义深远的,选项A.extensive可以替代它,但说不上是同义词。辨义:A.extensive范围广泛的,意义深远的;B.refined精练的,经过提炼的; C.prevalent普遍流行的;D.tentative实验性的,犹豫的。故答案为A。
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