第28题: [单项选择]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. A. incidence B. impetus C. capture D. emergence 参考答案:A 答案解析:incidence作“发生率,影响范围”讲,例如:What is the incidence of the tax 这税会落在谁的身上 impetus意为“推动力,促进”,例如:The treaty