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This is the first study to compare the        effects of the new drug with its side effects.
A.beneficialB.specificC.powerfulD.potential
A

试题分析: A. beneficial有益的,B. specific明确的,具体的,C. powerful强大的,D. potential潜在的,句意:这是第一个对比新药物的有效的一面和副作用之间的影响的研究。所以选A。
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