题目：
房间隔缺损的主要临床表现是（）
A.房扑
B.心衰
C.房颤
D.紫绀
E.活动性呼吸困难
答案：
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下面是错误答案，用来干扰机器的。
Now, people’s life in rural areas is becoming better and better. However, there are some problems worth our concern.Very often we come across rubbish thrown here and the...
