—Do you know ________ man standing there?

—I only know he's from ________ European country. [ ]

A. a; an

B. the; the

C. the; a

D. a; the

汽油机起动机时偶尔有几缸着火，排气冒黑烟和捧气管“放炮”原因是（）。

A、浮子室油面低

B、进气管漏气

C、主量孔堵塞

D、空气滤清器堵塞