60. [url=]Red blood cells in which the malarial-fever parasite resides are eliminated from a person[/url]’s body after 120 days. Because the parasite cannot travel to a new generation of red blood cells,[c1] [url=]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.[/url][c2] Which of the following, if true, most seriously weakens the conclusion above? (A) The fever caused by the malarial parasite may[url=] resemble the fever caused by flu viruses.[/url][c3] [url=](B)[/url][c4] The anopheles mosquito, which is the principal insect carrier of the malarial parasite, has been eradicated in many parts of the world. [url=](C)[/url][c5] Many malarial symptoms other than the fever, which can be suppressed with antimalarial medication, can reappear within 120 days after the medication is discontinued. [url=](D)[/url][c6] 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. D (E) In any region infested with[url=] malaria-carrying mosquitoes,[/url][c7] there are individuals who appear to be immune to malaria.
[c1]Reasoning
[c2]因果型结论
[c3]无关
[c4]无关
[c5]Medication discontinued与文中讨论的没有联系
[c6]寄生在cells of the spleen的p比red blood cells 消失得更慢,即大于120,所以病人120天后复发还是有可能是疟疾热的。割断因果,bingo
[c7]无关 |