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【题目】The research lacks evidence, and therefore, its conclusions are doubtful.
A.solid
B.fierce
C.severe
D.potential

【答案】A
【解析】句意:这个研究缺乏可靠的证据,因此,它的结论是值得怀疑的。A.solid“可靠的,可信赖的”; B.fierce“凶猛的,残忍的 ”;C.severe“严峻的,严厉的 ”;D.potential“潜在的,可能的”。根据句意,选A。

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