下列哪项不是使用扰生素引起的（）
A.菌群失调
B.霉菌感染
C.变态反应
D.耳聋
E.肝炎
参考答案：E
He knows )____ English but he has _____ English friends.[ ]
A. few; little
B. little; few
C. little; a few
D. a few; little
混炼前原材料的预加工有哪些工序？
