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According to the recent research, heavy coffee drinking and heart attack is not necessarily      and effect
A.reasonB.impactC.factD.cause
D
句意:最近一项研究证明,过量饮用咖啡与心脏病并没有必然的因果关系。本题考查短语用法。cause and effect为固定短语,意为“因果关系”。reason原因;influence影响;fact事实,都不符合题意。
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