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

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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