可燃气体检测仪可以（）。

A．在开火票前确认动火环境是否安全

B．作可燃气体报警仪

C．硫化氢检测仪

D．硫化氢报警仪

There are many ___________in our school this year.    [ ]

A. women teachers    

B. women teacher    

C. womans teachers  

D. woman teacher