The reason_____ she gave for not being present was _____the heavy snow prevented her coming.

A．why; because

B．why; whether

C．that; that

D．how; that

在下列部位中，哪个不是继发孔房间隔缺损的病变部位（）

A.卵圆窝部位的房间隔

B.下腔静脉开口处附近的房间隔后下方

C.三尖瓣口附近的房间膈下部

D.上腔静脉开口处附近的房间隔后上方

E.冠状静脉窦口附近的房间隔