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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

    解析试题分析： 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。
    考点：考查形容词辨析

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