先天性主动脉缩窄与特发性肺动脉扩张的肺血管改变均正常。
参考答案：对
脓血便多见于（）
A.阿米巴痢疾
B.急性胃肠炎
C.霍乱
D.急性细菌性痢疾
E.上消化道出血
The bike____ .Let's take a bus instead, [ ]
A. is wrong
B. isn't work
C. has broken down
