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标题: 2004.12 Section A 12 [打印本页]

作者: kingme 时间: 2006-5-30 03:47
标题: 2004.12 Section A 12
Biologists have noted reproductive abnormalities in fish
that are immediately downstream of paper mills. One
possible cause is dioxin, which paper mills release
daily and which can alter the concentration of
hormones in fish. However, dioxin is unlikely to be the
cause, since the fish recover normal hormone
concentrations relatively quickly during occasional mill
shutdowns and dioxin decomposes very slowly in the
environment.
Which one of the following statements, if true, most
seriously weakens the argument?
(A) Some of the studies that show that fish recover
quickly during shutdowns were funded by
paper manufacturers.
(B) The rate at which dioxin decomposes varies
depending on the conditions to which it is
exposed.
(C) Normal river currents carry the dioxin present in
the river far downstream in a few hours.
(D) Some of the fish did not recover rapidly from
the physiological changes that were induced by
the changes in hormone concentrations.
(E) The connection between hormone concentrations
and reproductive abnormalities is not
thoroughly understood.

Why C not D? I did not figure out the "trick" to this question however.

[此贴子已经被作者于2006-5-30 3:50:38编辑过]

作者: kallyli 时间: 2006-5-30 23:19

d错在some上，题目中说的是泛指fish，没说个案

题目中说paper mill关闭的时间足以是fish修复荷尔蒙，而c选项用了他因削弱，说河水可以把带澳星经常性的带给fish

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