人体与病原体处于相持状态,不出现临床症状,不排出病原体()
A.病原体被消灭或排出体外
B.病原体携带状态
C.隐性感染
D.潜在性感染
E.显性感染
参考答案:D
I _____ come from England. I _____ from Canada. [ ]
A. am not; come
B. am; am
C. /; am
D. don't; come
Do you like apples? [ ]
A. Yes, I do.
B. No, we do.
C. No, we like.