造成癫痫的常见原因()。
A.产伤
B.颅内肿瘤
C.脑炎
D.脑囊虫病
E.以上都是
参考答案:E
有三条自来水管道向某地区供水,每条管道的故障率都是0.3,只要至少有一条管道不出故障,就能保证该地区正常供水,则该地区正常供水的概率为______.
_______ is the bridge over the river and _______ does it take you to get there? [ ]
A. How far, how long
B. How far, how far
C. How long, how long
D. How long, how far