青霉素中过敏原的主要决定簇是 （）
A.羧基
B.苯环
C.青霉噻唑基
D.酰氨基
E.8-内酰胺环
参考答案：C
She said her grandmother ______ in 1937.
A．had been born
B．was born
C．was died
D．had died
试述社会环境对消费文化的影响。
