Dear Chairman,

I’m a student from Class1, Grade3. I want to join their club. At school, I study very hardly, and I’m always ready to help others. I got on well with my classmates but I like to help them with their lessons. I often help the old to crossing the road. On the bus, I often offer any possible help to any others. On weekends, I usually go to the park pick up rubbish. I want to join the club very much. For one reason,, I like to make friend and work with others. For other, I will have more chances to help others. I would be glad if accepting..

肺的有效通气量是指（）

A.肺活量

B.每分肺泡通气量

C.时间肺活量

D.肺通气量

E.潮气量