Tom is only ______.

I don’t think a _______ boy should be allowed to drive.

A．fourteen-year-old;fourteen-year-old

B．fourteenyearsold;fourteen-year-old

C．fourteenyearsold;fourteen-years-old

D．fourteen-year-old;fourteenyearsold

下列哪种疾病可出现肺血减少的X线征象是（）

A.室间隔缺损

B.风湿性心脏病二尖瓣狭窄

C.原发性肺动脉高压

D.高血压性心脏病

E.房间隔缺损