潜伏期感染与病原携带状态不同之处在于A．病原体可引起机体免疫_爱下问搜题

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问题单项选择题

潜伏期感染与病原携带状态不同之处在于

A．病原体可引起机体免疫应答

B．无明显临床症状

C．并非所有传染病都存在

D．可在一守条件下引起显性感染

E．病原体一般不排出体外

答案

参考答案：E

补全对话，情景问答

仔细阅读下面句子，给下列问句选择相应的答句。

( ) 1. How much for one cake?
( ) 2. What would you like, please?
( ) 3. What's your favourite fruit?
( ) 4. May I borrow your pencil?
( ) 5. Do you have any oranges?
( ) 6. Would you like some soup?

A. No, thanks.
B. Sure.
C. I'd like a hamburger, please.
D. Bananas.
E. Five yuan.
F. Yes, lots of oranges.

问答题简答题

简述肉芽组织的结构特点及功能。