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The extremely dry conditions through Iowa over the past five years ______ a great deal of damage to the state.

A. (A) causes
B. (B) causing
C. (C) to cause
D. (D) have caused

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患者，男，25岁。头痛、咽痛三四天，出现心烦郁闷，躁扰不宁，夜不能寐，小便黄，舌尖红，脉数。用药宜首选( )

A. 麻黄、石膏
B. 黄连、黄芩
C. 赤芍、牡丹皮
D. 栀子、黄柏
E. 栀子、淡豆豉

Had he set out by taxi rather than by bus, John ______ reached the bank in time for the money transfer.

A. (A) can have
B. (B) could have
C. (C) will have
D. (D) had

数据操作包括下列哪几项

A. 操作
B. 关于操作的函数
C. 有关的操作规则
D. 规则映射
E. 规则的函数表象A．acB．cdeC．a

______ in 1983, Cadence has since become one of the largest makers of chip design software, partly through a string of acquisitions.

A. (A) Founded
B. (B) Found
C. (C) Finding
D. (D) Having found