问题
单项选择题
直肠狭窄的产生是由于（）
A.术后直肠粘膜发生大面积{感染
B.术中未能保留皮桥
C.肛管皮肤损伤过多
D.皮肤对合不良
E.以上均正确
答案
参考答案：A
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直肠狭窄的产生是由于（）
A.术后直肠粘膜发生大面积{感染
B.术中未能保留皮桥
C.肛管皮肤损伤过多
D.皮肤对合不良
E.以上均正确
参考答案：A
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| Mike didn't hand in his homework on Monday morning. He told Mr. Black that after he had breakfast on Sunday, he had a trip with Michael. They had been walking from eight to eleven. Then they had lunch in a country restaurant for two hours. In the afternoon, when he was ready to do his homework, Bob came and asked him to watch an opera. It began at four and ended at six. After he had supper, he listened to music with his MP3 player from seven to eight. Then he turned on the TV, and watched a new TV show. When the show was over, it was already eleven o'clock. He was too tired to do his homework.
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