______________ he live in the country? [

This is the best way I could think of _______ people getting into the dangerous areas.

A．stopping

B．to keep

C．to stop

D．keeping

新上市的某品牌手机，原价1500元，现价1200 元，现在打几折出售？

— Do you know his parents?

— Yes, they _____ English teachers in our school.  [ ]

A. are all          

B. all are          

C. are both

以下程序运行后的输出结果是 #include＜stdio.h＞ main(){ 　int y=10; 　while(y--); 　printf("y=%d\n", y)； }

A．y=0

B．y=-1

C．y=1

D．while构成无限循环

下述各项控制梭状芽孢杆菌生长繁殖的方法中错误的是（）

A.用氧化剂冲洗创口

B.用止血带防止感染扩散

C.用3个大气压的纯氧治疗

D.投给大剂量的青霉素

E.可使用四环素