与结节性红斑有关的致病因素有（）。
A.遗传因素
B.感染因素
C.以上均有
D.以上均无
E.物理因素
参考答案：B
-Good morning, Mr Brown. Would you please tell me the result of the exam?
-OK. You did quite welt. You made __________ mistakes.[ ]
A. a few
B. few
C. little
D. a little
民主集中制
