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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?
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.
正确答案：D
题目解析：
题意：疟疾发热的寄生虫寄生在红细胞内，红细胞120天后，会从人体内排出，而寄生虫，不能够转移寄生在新的红细胞内，所以120天后，当到达一个没有疟疾的地方时，如果出现发烧，那跟疟疾寄生虫是一点关系都没有了。 问什么观点，反驳了以上的观点。 A，说疟疾发烧和flu发烧的迹象一样。无关 B，有一种蚊子，这种蚊子是疟疾寄生虫的主要携带者，已经被根除了。无关 C，无关，因为题目只让反驳关于发烧的，跟其他symptoms无关 D，疟疾寄生虫会寄生到spleen里去，不会那么容易被排除体外，所以120天后到了疟疾free的地方出现发烧，那还是有可能是因为疟疾。 E,有疟疾携带的蚊子的地方，有些人对疟疾免疫。无关
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