关于先天性肾脏病变，下列说法正确的是（）
A.异位肾比正常肾的功能更易受损
B.马蹄肾的结石发生率高
C.交叉异位肾的输尿管开口于膀胱同一侧
D.马蹄肾的输尿管从肾联合背侧通过
E.肾脏发育不全者的膀胱三角区可不对称
参考答案：A, B, E
解析：交叉异位肾为一不多见的先天异常，即一侧肾脏由原侧跨过中线，移位到对侧，输尿管开口于膀胱两侧。马蹄肾的肾盂因受融合的限制，不能正常地旋转，输尿管较正常为短，越过狭部前面下行。
Stress is everywhere in our everyday life. Not only men have it, but also women and young people. The most important reasons of stress are: death, diseases(疾病), exams, making money, getting married(结婚), moving houses, changing jobs, ending friendship and so on. How do you know whether you have stress? Could you give your answers to the following questions? Stress Test
Doing relaxing exercises, talking with friends and listening to light music are all usual ways of relieving（减轻）stress. However, doctors now say that there are easier ways—people should laugh and smile more often. When you laugh and smile, your body relaxes. They also say that people, especially men, should X_ more often ,because crying is the natural way of relieving stress. 小题1:Which of the followings is NOT the reason of stress?
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