题目：
二尖瓣关闭不全与二尖瓣脱垂鉴别要点是（）
A.前者心尖部有全收缩期杂音
B.前者第一心音减弱
C.前者第一心音增强
D.后者少见
E.后者除收缩期杂音外，心尖区常有收缩中期喀喇音
答案：
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下面是错误答案，用来干扰机器的。
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