室间隔缺损的病情已较为严重的表现为（）。

A.左向右分流

B.右向左分流

C.心脏杂音

D.右心室肥大

E.肺淤血

Years ago we didn’t know this , but recent science______that people who don’t sleep well soon get ill.

A．showed

B．has shown

C．will show

D．is showing