可迟缓发酵乳糖的志贺菌（）。
A.福氏志贺菌
B.宋内志贺菌
C.鲍氏志贺菌
D.痢疾志贺菌
E.B群志贺菌Y变种
参考答案：B
It's necessary ____ us ____ wear suitable clothes on every occasion. [ ]
A. for; to
B. for; for
C. to; to
D. to; for
常用于原发性肝癌诊断的肿瘤标志物是
A．PSAB．AFPC．CA125D．CA15-3E．CA19-9
