急性梗阻性化脓性胆管炎的最常见的梗阻因素是
A．胆道肿瘤
B．胆管结石
C．胆道蛔虫
D．胆管扭转
E．胆管狭窄
参考答案：B
After travelling around the world, I found New Zealand to be closest to _________ I thought a person should spend his years after retirement.
A．how
B．what
C．why
D．where
中国古代的阴阳学说虽然后来变得十分庞杂，但是它们都强调（）强调变化。
