问题
单项选择题
大型房间隔缺损后期出现青紫时肺血管的改变是
A．肺血增多
B．动力型肺动脉高压
C．梗阻型肺动脉高压
D．肺动脉痉挛
E．肺门阴影缩小
答案
参考答案：C
解析：大型房间隔缺损后期肺循环血量增加，压力增高，形成肺动脉高压，左向右分流减少，甚至出现右向左分流，临床出现发绀。
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大型房间隔缺损后期出现青紫时肺血管的改变是
A．肺血增多
B．动力型肺动脉高压
C．梗阻型肺动脉高压
D．肺动脉痉挛
E．肺门阴影缩小
参考答案：C
解析：大型房间隔缺损后期肺循环血量增加，压力增高，形成肺动脉高压，左向右分流减少，甚至出现右向左分流，临床出现发绀。
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| Last year my English class was _1_ for me. First of all, it wasn't easy for me to understand the teacher when she _2_ to the class. To begin with, she spoke too quickly, and I couldn't _3_ every word. Later on, I realized it doesn't matter if you don't understand every word, _4_ I was afraid to speak in class because I thought my classmates might laugh _5_ me. I couldn't always make complete sentences, either. Then I started to _6_ English-language TV. It helped a lot. I think that doing lots of listening practice is one of the secrets of _7_ a good language learner. Another thing that I found very difficult was English _8_. So I decided to take lots of grammar notes in every class. | ||||
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