大型室间隔缺损后期出现持续青紫时肺血管压力的改变是（）
A.增高
B.降低
C.不变
D.动力型肺动脉高压
E.梗阻型肺动脉高压
参考答案：E
- Did you get a dictionary?
- No, I _____, but there were not any _____.
A．tried; to be left
B．had tried to; leaving
C．tried to; left
D．had tried; have left
国际邮件中，按规定下列（）为禁止寄递的物品。
A、书籍
B、各国货币
C、磷
D、氰化物
