–I’m in a bad mood. You know I failed in this exam.

–     . A bad grade doesn’t mean you’re not clever. Just study harder.

A．Forget it

B．Cheer up

C．Never mind

D．Don’t mention it.

房间隔缺损的血流动力学改变正确的是（）

A.左心容量负荷加重

B.右心容量负荷加重

C.肺动脉收缩压降低

D.右心压力负荷过重

E.左心压力负荷过重