According to the recent research, heavy coffee drinking and heart attack is not necessarily      and effect
A．reasonB．impactC．factD．cause
D
句意：最近一項研究證明，過量飲用咖啡與心臟病并沒有必然的因果關系。本題考查短語用法。cause and effect為固定短語，意為“因果關系”。reason原因；influence影響；fact事實，都不符合題意。
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