首字母填空（5分）

Dear Mum,

I don’t think you understand my life. You think I should study a__1__ the time. I know you want me to find a good job when I g___2___ up, but I would like to have a w___3___ time, too. You never think about fun things for me to do l__4___ music, sports or art. Two days ago, when I was watching a football game on TV, you asked me to s___5___ and to do my homework.. After f__6___my homework, you didn’t let me read football books or m___7___ still. You said I had to go to bed early .You also said I needed at least 8 hours’ s____8___at night. I feel so t___8__now because I don’t have any time to relax(放松) myself. I r___10___ love you, mum, but I wish you could try not to be so hard on me.

Love,

Jim

属于一级可燃气体的是（）。

A、氢气

B、甲烷

C、乙炔

D、环氧乙烷

E、氨气