2. 外语
  3. Red blood cells in which the malarial-fever parasite resides are eliminated from a person’s body after 120 days. Because the par

Red blood cells in which the malarial-fever parasite resides are eliminated from a person’s body after 120 days. Because the par

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问题 Red blood cells in which the malarial-fever parasite resides are eliminated from a person’s body after 120 days. Because the parasite cannot travel to a new generation of red blood cells, any fever that develops in a person more than 120 days after that person has moved to a malaria-free region is not due to the malarial parasite. Which of the following, if true, most seriously weakens the conclusion above?
选项 A、The fever caused by the malarial parasite may resemble the fever caused by flu viruses.
B、The anopheles mosquito, which is the principal insect carrier of the malarial parasite, has been eradicated in many parts of the world.
C、Many malarial symptoms other than the fever, which can be suppressed with antimalarial medication, can reappear within 120 days after the medication is discontinued.
D、In some cases, the parasite that causes malarial fever travels to cells of the spleen, which are less frequently eliminated from a person’ s body than are red blood cells.
E、In any region infested with malaria-carrying mosquitoes, there are individuals who appear to be immune to malaria.
答案D
解析 该短文得出结论，因为疟疾寄生虫不能在血红细胞中寄居超过120天，在传染发生120天之后，那些疟疾寄生虫就不能引起发热了。然而，根据(D)，人体内有一个地方该寄生虫可以在传染之后寄居超过120天，因此，(D)削弱了该结论并成为正确答案；选项(A)仅指出疟疾热的症状与其他疾病的症状相似，选项(C)仅指出别的疟疾热症状的存在，选项(E)仅指出了对疟疾免疫的可能性，但这三个选项均与在什么条件下会出现疟疾热的问题无关；选项(B)确认了有没有疟疾的地区存在，但同该结论没有其他关系。
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