TEST 20-11

Miracle

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

答案是E， 文章是因果结构，如果按他因的方式，C为什么不对呢？

番茄炒蛋

c怎么会有关系呢，要算有也是加强啊，呵呵，怎么会是削弱哦
只有e了，每一种细菌都要感染一次才有抗体，这样一来就可以感染很多次而并不是因为同一种病毒而感染很多次