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当前学科：皮肤科住院医师
题目：
单选题
女性，35岁，风湿性心脏病二尖瓣狭窄病史10年，脐周剧痛2小时，心率112次／分，脐周压痛及反跳痛，肠鸣音减弱，心电图示心房颤动，尿镜检白细胞3～5／HP，首先考虑的诊断是（）
A
急性肠炎
B
肠梗阻
C
肾动脉栓塞
D
肠系膜动脉栓塞
E
脾栓塞
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Today ,as in every other day of the year ,more than 3000 U.S. adlescents will smoke their first cigarette on their way to becoming regular smokers as adults. During their lifetime,it can be expected that of these 3000 about 23 will be murdered,30 will die in traffic accidents, and nearly 750 will be killed by a smoking-related disease. The number of deaths attributed to cigarette smoking outweithts all other factors, whether voluntary or involuntary, as a cause of death. Since the late 1970s, when daily smoking among high school seniors reached 30 precent , smoking rates among youth have declined . While the decline is impressive ,several important issues must be raised. First, in the past several years,smoking rates among youth have declined very little. Second,in the late 1970s ,smoking among male high school seniors exceeded that among female by nearly 10 percent . The statistic is reversing.Third ,several recent studies have indicate high school dropouts have excessively high smoking rates, as much as 75 percent . Finally, thouth significant declines in adolescent smoking have occurred in the past decade,no definite reasons for the decline exist. Within this context,the Naional Cancer Instiute (NCI) began its current effort to determine the most effecive measures to reduce smoking levesl among youth. By "dropout" the author means（）.