At present, it is not possible to confirm or to refute the suggestion that there is a causal relationship between the amount of

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问题 At present, it is not possible to confirm or to refute the suggestion that there is a causal relationship between the amount of fat we eat and the______of heart attacks.

选项 A、incidence
B、impetus
C、rupture
D、emergence

答案A

解析 四个选项的意思分别是:incidence发生率;impetus动力;rupture破裂,绝交;emergence出现,发生。句意:脂肪的摄入量和心脏病的发病率有关联,目前对这种说法既不能肯定也不能反驳。据此可知,正确答案是A选项。
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