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

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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