— I hear there'll be _____ talk on teenage problems next Monday.

— Do you mean _____ talk our teacher asked us to listen to? [ ]

A. a; the

B. a; a

C. the; the

D. the; a

人防规定，我国的防空警报分为预先警报、（）和解除警报三种。

A.侦查警报

B.严重警报

C.空袭警报

D.敌情警报