下列各项均为"急腹症"的病因，但除外
A．肠梗阻
B．胃肠穿孔
C．卵巢扭转
D．宫外孕
E．肝淤血
参考答案：E
-Which of the two computer games did you prefer?
-Actually I didn't like_______. [ ]
A. both of them
B. either of them
C. none of them
D. neither of them
煤气柜为（）级危险源点。
