平静呼气末肺内的气体量为（）

A.肺活量

B.时间肺活量

C.补呼气量和潮气量

D.补吸气量和余气量

E.功能余气量

A number of students ____ seen the film. That is，the number of the students who have seen the film____ large.

A．have; is

B．has；are

C．has; is

D．have； is