－I’m sorry I’m late. My bus got blocked in the traffic jam on Yu’ao Bridge. 

－         .

A．You are to blame for this.

B．Come on, not again!

C．That's quite understandable.Come on in.

D．Never mind. I am often late as well.

下列叙述中，哪项是正确的

A．最大呼气所能呼出的气量称为余气量
B．平静呼气末在肺内残留的气体量称为机能余气量
C．机能余气量是最大呼气末存留于肺中的气体量
D．补呼气量与机能余气量两者之和称为余气量