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人类对传染病的斗争是从天花开始的。接种牛痘最终导致完全根除天花,并且推广为对抗许多病原体的可靠的保护方法。 [ 请在( )中填编号,横线上填文字。 ] ( 1)大多数疫苗由减毒的生物、死的生物、失活的毒素或由亚细胞的片段组成。疫苗相当于图甲中的( )________。自身机体内的 细胞也可能成为1。 ( 2)图毒性强的S病原体进入接种过该疫苗的人体A,会发生二次免疫反应,此时图甲中的( ) 能分裂产生新的 ,由( )________细胞产生大量的5 , 这种免疫属于 __________ 免疫。 ( 3)题干中提到的“可靠的保护方法”是指 ,传染病病愈后的免疫力的时间,有的持续终生,有的不长。免疫时间较短的主要原因,一般可能是病原体________。 ( 4 )病原体进入人体内后,可以清除它的细胞或物质有 _______ 。
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举一反三
【单选题】听力原文：M: Excuse me, can you tell me which bus I should take to the People's park? W: I'm afraid I can't. I've only been here for several days. Q: Why can't the woman give the man directions? (13)
A.
She is afraid.
B.
She has never taken the bus before.
C.
She is new here.
D.
She does not want to tell him.
【简答题】当我提及这个话题时,他总是保持沉默。
【单选题】听力原文：F: Excuse me, could you tell me which platform. the 7 o'clock train leaves from? M: Yes, it's platform. 10. F: Thank you. Which end of the station is that? M: The left-hand side, but you'd better...
A.
Platform. 8
B.
Platform. 10
C.
Platform. 5
【单选题】Excuse me, could you please tell me which gate ______?
A.
we have to go to
B.
we had to go to
C.
do we have to go to
D.
did we have to go to
【单选题】听力原文：M: Excuse me, can you tell me which bus I should take to the People's park? W: I'm afraid I can't. I've only been here for several days. Q: Why can't the woman give the man directions? (8)
A.
She is afraid.
B.
She has never taken the bus before.
C.
She is new here.
D.
She does not want to tell him.
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