下列哪种毒物中毒时发病最快（）。
A.乐果
B.敌敌畏
C.敌百虫
D.对硫磷（1605）
E.巴比妥类药物
参考答案：B
The number of the people who can afford to buy their own house ______ more than 60%,but a number of houses _______.
A．are; hasn’t been built
B．are; has built
C．is; haven’t been built
D．is; have built
县、处级副职相对应于( )级。
A．9～12
B．9～11
C．8～10
D．8～11
