______ we ______ to these immediate crises abroad, we also will not let up in our effort to deal with the pressing, ongoing challenges facing our country.

A．With; will respond

B．As; respond

C．As; answer

D．with; will answer

具有快速杀菌作用的药物是：

A．四环素
B．氯霉素
C．二者皆是
D．二者皆不是