标题: Another difficult CR [打印本页] 作者: primefang 时间: 2002-7-22 10:41 标题: Another difficult CR
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 under-
mines 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.
I think the answer is E, rite?作者: primefang 时间: 2002-7-22 18:58
A 是否是支持，?
能 rationalize 一下E ma?
thx作者: tongxun 时间: 2002-7-23 02:18
我觉得A象无关多与支持。E、直接驳斥了only weakly
stimulated by any single exposure to the malaria
parasite 。E说明病人得病后获得了免疫力，再次发病是因为感染了不同类型的原虫所导致。
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