The reason _________the president kept silent is still unknown．
A. how
B. why
C. when
D. what
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Mary looks great_________ this pair of trousers．
A. in
B. by
C. on
D. at
The weather report says it again_________ tomorrow．
A. rains
B. rained
C. will rain
D. has rained
Bill has a _________very high price for the car．
A. paid
B. cost
C. bought
D. spent
70岁，男性进行性排尿困难四年，多次出现过急性尿潴留，目前排尿呈点滴状，前列腺明显增大，质软，弹性，残余尿300毫升，患者有冠心病已数年，时有心律不齐和心绞痛发作，最好采用哪种治疗方法。
A. 用女性激素
B. 长期留置导尿管
C. 耻骨上膀胱造瘘
D. 前列腺切除
E. 双侧睾丸切除
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