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【华慧考博】考博英语每日一练（2.12）2019考博加油！
1. ______, the book has many mistakes.
A. Having not been written carefully
B. Not writing carefully
C. Having written not carefully
D. Not having been written carefully
2. 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. rupture
D. emergence
【华慧考博】考博英语每日一练（2.12）参考答案
1.D
【句意】因为这本书写得不细心，所以它有很多错误。
【解析】语法结构。非谓语动词的否定式通常是就在非谓语动词之前加 not 或 never，having been written carefully是过去分词的完成式，否定词not放在它的前面即可，因此答案选D。
2.A
【句意】现在，去证实或驳斥这种观点（即我们所摄入的脂肪量和心脏病的发生率之间存在因果关系）是不可能的。
【解析】名词词义辨析题。incidence“发生率；影响”；impetus“动力；促进；冲力”；rupture“破裂；决裂”；emergence“浮现；发生；露头”。由关键词“heart attacks心脏病发作”的对应知“发生率”符合语境，由此知A项正确。
