原发孔型房间隔缺损二维超声检查所见为（）。

A.房间隔最低处（房、室间隔连接处）缺损

B.左心室扩大

C.房间隔最上部（近心房顶部处）缺损

D.室间隔上段缺损

E.房间隔中央部缺损

.

In the UK, what impressed exchange students most was the Student Activity, ____ they could get lots of information outside.

A．where

B．that

C．which

D．when