Our firm is with in（）from the airport.

A.thirty minutes’ drive

B.adrive of thirty minutes

C.driving for thirty minutes

D.driving car by thirty minutes

3岁男孩，自幼喂养困难，易患肺炎。体检：胸骨左缘3、4肋间闻及4/6级全收缩期杂音，传导广泛，伴有震颤，P2亢进。最可能的诊断是，

A．房间隔缺损

B．室间隔缺损

C．动脉导管未闭

D．风湿性心肌炎

E．法洛四联症