The research lacks evidence，and therefore，its conclusions are doubtful.

A．solid B．fierce C．severe D．potential

A

【解析】

試題分析：考查形容詞辨析。A.可靠的，可信賴的 B.兇猛的，殘忍的 C.嚴峻的，嚴厲的 D.潛在的，可能的。句意：這個研究缺乏可靠的證據(jù)，因此，它的結論是值得懷疑的。故選A。

考點：考查形容詞辨析

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