—Mum, could you buy me a dress like this?  

—Certainly, we can buy ______ one than this, but ______ this.    [ ]

A. a better; better than  

B. a worse; as good as

C. a cheaper; as good as  

D. a more important; good as

2岁女孩，身体瘦弱，多次患肺炎。胸部X线检查：肺血多，左心房，左心室增大，主动脉增宽。应诊断为

A．房间隔缺损
B．室间隔缺损
C．动脉导管未闭
D．法洛四联症
E．艾森曼格综合征