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标题: CR大全-20-11 [打印本页]

作者: paopao 时间: 2004-6-18 14:38
标题: CR大全-20-11

11. In malaria-infested areas, many children tend to suffer several bouts of malaria before becoming immune to the disease. Clearly, what must be happening is that those children’s immune systems are only weakly stimulated by any single exposure to the malaria parasite and need to be challenged several times to produce an effective immune response.

Which of the following, if true, most seriously undermines the explanatory hypothesis?

(A) Immediately after a child has suffered a bout of malaria, the child’s caregivers tend to go to great lengths in taking precautions to prevent another infection, but this level of attention is not sustained.无关

(B) Malaria is spread from person to person by mosquitoes, and mosquitoes have become increasingly resistant to the pesticides used to control them.无关

(C) A certain gene, if inherited by children from only one of their parents, can render those children largely immune to infection with malaria.

(D) Antimalaria vaccines, of which several are in development, are all designed to work by stimulating the body’s immune system.无关（E）

(E) There are several distinct strains of malaria, and the body’s immune response to any one of them does not protect it against the others.

削弱题，我选了C，认为是他因，答案是E

论据：小孩感染多次后，才能产生M免疫

结论：原因：是因为感染多次才产生M免疫

削弱：应该是他因

C为何不对呢谢谢

作者: mindfree 时间: 2004-6-19 04:00
How do you relate "bouts of infection" with C? In another word, how can C explain the fact that children have to have several bouts of infection before they are immune? Are you assuming something that is not referred to in the question? If yes, it is not allowed.

作者: robertchu 时间: 2004-6-19 06:56
Agree.
C才是无关的．
E 则給出了一个很好的他因： malaria 有多种不同的 strain,　要全部都得了之后才会对所有的都有抵抗.

作者: calla 时间: 2005-4-26 13:36

按照C的意思，那些因为遗传而天生具有免疫力的小孩就不会感染malaria了。但是这与题目不符合，题目列出的事实是：很多小孩 suffer several bouts of malaria before becoming immune to the disease.

另一方面，C中的情况即使存在，也不能削弱原文的推理，因为原文针对是那些本身没有免疫能力的小孩。

[此贴子已经被作者于2005-4-26 13:37:15编辑过]

作者: zj1179 时间: 2005-6-14 02:20

看过讨论我同意C是不对的，可是还是不太理解E，哪位能给我解释一下E的意思，谢谢！

作者: 笨笨可可 时间: 2008-6-11 16:47

以下是引用zj1179在2005-6-14 2:20:00的发言：

看过讨论我同意C是不对的，可是还是不太理解E，哪位能给我解释一下E的意思，谢谢！

我也不懂E是什么削弱？？

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