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题目材料：
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?
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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.
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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.
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C.In the wild, hamsters are at least occasionally infected with Lyme disease by tick bites.
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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.
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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.
A显示答案
