.

When I left _________ college, I got a job as _________ journalist in a magazine office．

A．a; the

B．/; a

C．the; a

D．/; the

下列瓦斯检测仪器仪表适用于检测高浓度瓦斯的有（）。

A、热催化式甲烷检测报警仪

B、热导式甲烷检测报警仪

C、光学瓦斯检测仪