Red blood cells in which themalarial-fever parasite resides are eliminated from a person's body after 120 days. Because the parasite cannot travel to a newgeneration of red blood cells, any fever that develops in a person more than 120 days after that person has moved to a malaria-freeregion is not due to the malarial parasite.
Whichof the following, if true, most seriously weakens the conclusion above?
(A) The fever caused by the malarial parasite mayresemble the fever caused by flu viruses.
(B) The anopheles mosquito, which is the principalinsect carrier of the malarial parasite, has been eradicated in many parts of the world.
(C) Many malarial symptoms otherthan the fever, which can be suppressed with antimalarial medication, can reappear within 120 days after the medication isdiscontinued.
(D) In some cases, the parasitethat causes malarial fever travels to cells of the spleen, which are less frequently eliminated from a person's body than arered blood cells.
(E) In any region infested withmalaria-carrying mosquitoes, there are individuals who appear to be immune to malaria.
E是正确的,但A也没错啊。。。
OG解释A:The issue is not about a similarity of symptoms butabout where the parasites reside.
也有可能是malarial-fever parasite引起其他疾病,引进其他病毒啊,望指点。。。作者: haze619 时间: 2012-3-4 10:14
想问一下C为什么错呢?D正确的理由我接受。但是C错误的理由我不明白。og给出的解释是原文没有给出当一个病患搬到malaria-free area 120天后,停止用药与症状复发之间的关系假定。照这样说的话,D原文也没说啊,还不是推测出来的。为什么C就不能当是推测出来的呢。作者: michellehoS 时间: 2012-3-22 20:35
Red blood cells in which themalarial-fever parasite resides are eliminated from a person's body after 120 days. Because the parasite cannot travel to a newgeneration of red blood cells, any fever that develops in a person more than 120 days after that person has moved to a malaria-freeregion is not due to the malarial parasite.
(1) 寄生虫 (Parasite)寄居的红血细胞120天后被消灭了。 这个寄生虫又不能转移到新的红细胞。
(2)120天后这个人到没有痢疾malaria 的地方发烧了。
结论: 这个人的发烧不可能是由(痢疾)寄生虫引起的。
D攻击: 引起痢疾的寄生虫藏到了一个不可能被消灭掉的地方。 所以即使120天后发烧还是有可能被这种寄生虫引起。作者: michellehoS 时间: 2012-3-22 20:41
Red blood cells in which themalarial-fever parasite resides are eliminated from a person's body after 120 days. Because the parasite cannot travel to a newgeneration of red blood cells, any fever that develops in a person more than 120 days after that person has moved to a malaria-freeregion is not due to the malarial parasite.
(1) 寄生虫 (Parasite)寄居的红血细胞120天后被消灭了。 这个寄生虫又不能转移到新的红细胞。
(2)120天后这个人到没有痢疾malaria 的地方发烧了。
结论: 这个人的发烧不可能是由(痢疾)寄生虫引起的。
D攻击: 引起痢疾的寄生虫藏到了一个不可能被消灭掉的地方。 所以即使120天后发烧还是有可能被这种寄生虫引起。
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