------What will you do during the coming winter vocation?

------ I don’t know, but it’s about time ______ something.

A．I’m deciding

B．I’ll decide

C．I’d decided

D．I decided

下述主动脉，肺动脉间隔缺损错误的是（）

A.由于胚胎期主动脉和肺动脉之间的分隔发育障碍所致

B.可分为近端型、远端型、完全缺损型

C.主动脉与肺动脉之间出现左向右分流

D.室间隔与左心室后壁增厚，运动减弱

E.彩色多普勒探及主动脉-肺动脉间的分流信号