血性耳漏常见于（）。
A.脑脊液耳漏
B.大疱性鼓膜炎
C.中耳胆固醇性肉芽肿
D.中耳癌
E.中耳血管球体瘤
参考答案：B, C, D, E
—You don’t seem to be quite yourself today. What’s wrong?
—Oh, I’m suffering from a cold. Nothing serious, _____.
A．yet
B．though
C．indeed
D．anyway
下列哪种偏倚不属于选择偏倚
A．入院率偏倚B．现患病例-新病例偏倚C．检出征候偏倚D．测量偏倚E．无应答偏倚
