公安基层工作是整个公安工作的（）。
A.基础
B.力量
C.根基
D.生命
参考答案：C
.
．She asked Mary_________her homework.
A．if she had finished
B．that whether she had finished
C．that if she has finished
D．whether she has finished
属于Ⅲ类抗心律失常药物是（）
A.美西律
B.胺碘酮
C.阿替洛尔
D.利多卡因
E.维拉帕米
