The research lacks  evidence, and therefore, its conclusions are doubtful.
A．solidB．fierceC．severeD．potential
A
【考點(diǎn)】形容詞詞義辨析
根據(jù)句意：研究缺乏實(shí)證（solid evidence），因此所得出的結(jié)論還有待考證。fierce激烈的；severe嚴(yán)重的；potential，有潛力的，均不符合語境，故排除。
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