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The immune systems of hamsters injected with laboratory cultures of Borrelia
The immune systems of hamsters injected with laboratory cultures of Borrelia
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2025-02-19
20
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问题
The immune systems of hamsters injected with laboratory cultures of Borrelia burgdorferi, the bacterium that causes Lyme disease, respond differently than do the immune systems of people infected with the bacterium as a result of the bites of ticks, the disease’s carrier. However, when hamsters are infected with the bacterium by tick bites, their immune-system response is identical to the human one. Probably, therefore, the bacterium in the ticks has a different form from the bacterium cultured in the laboratory.
The argument in the passage assumes which of the following?
选项
A、The difference in the manner in which the infection enters the body is not what causes the difference in the hamster’s immune-system response.
B、The human immune-system response to injection with Borrelia burgdorferi would be identical to the hamster’s immune-system response to injection with that bacterium.
C、In the wild, hamsters are at least occasionally infected with Lyme disease by tick bites.
D、There are no laboratory-cultured bacteria that would cause the hamster ’s immune system to react as it does when infected with Borrelia burgdorferi by a tick bite.
E、In rodents other than hamsters, the immune-system responses to Borrelia burgdorferi infections both by injection and by tick bite are identical to those in hamsters.
答案
A
解析
选项取反,感染进入体内的方式导致仓鼠免疫系统应对的差异一并非是两种细菌之间的差异,而是感染方式之间的差异导致免疫系统差异,寻找他因削弱原文,A正确。B项人类的应对方式在文章中是干扰内容。文章真正想要表达的就是仓鼠对两种感染方式的应对是不一样的,和仓鼠感染细菌是否应该和人类一样无关。C项和野外无关。D项文章只是讨论为什么仓鼠在两种感染方式下的应对方式不同,和是否存在相同效果的实验室细菌无关。反正文章讨论的只是那些和蜱虫叮咬感染的细菌产生效果不同的实验室细菌。E项本题和其他啮齿动物无关。
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