不属于非离子表面活性剂的是（）
A.司盘
B.吐温
C.苄泽
D.泊洛沙姆
E.卵磷脂
参考答案：E
-How long ________inBeijing?
-For just the weekend. I'II be back for work next Monday.
A． have you stayed
B． do you stay
C． did you stay
D．are you staying
大庾岭
