“Hope for the best and prepare for the worst.” is a proverb, ______ life is beautiful and full of

frustrations as well  

A．means

B．to mean

C．meaning

D．meant

治疗室性心律失常的首选药物是：

A．普萘洛尔
B．奎尼丁
C．维拉帕米
D．利多卡因
E．胺碘酮