引起急性胰腺炎最常见的病因是
A．胆管梗阻B．十二指肠液反流C．暴饮暴食D．高脂血症E．特异性感染
参考答案：A
— She is a credit to her family,for she has a small fortune ______ her credit.
— A credit to her family? Her father has to buy his daily necessities _______.
A. on;on credit
B. in;in credit
C. to;on credit
D. under;with credit
第四段主要说明了( )。
A．以龙和花(华)为标志的两种古文化的结合
B．以龙和花(华)为标志的两种不同文化真正结合到一起的证据
C．以龙和花(华)为标志的两种不同文化结合的地点、时间
D．近年来后期红山文化的考古发现
