Help?LSAT Section4-III-5

bigmouse · 发表于 2003-9-5 17:35:00

5. Animals with a certain behavioral disorder have unusually high level of aluminum in their brain tissue.Since a silicon-based compound binds to aluminum and prevents it from affecting the brain tissue. Animals can be cured of the disorder by being treated with the compound.
The argument is based on which one of the following assumptions?
(A) Animals with the disorder have unusually high but invariable levels of aluminum in their brain tissue.
(B) Aluminum is the cause of the disorder rather than merely an effect of it.
(C) Introducing the compound into the brain tissue has no side effects.
(D) The amount of the compound needed to neutralize the aluminum in an animal's brain tissue varies depending upon the species.
(E) Aluminum is never present in normal brain tissue.
answer:B my choice :C

心静 · 发表于 2003-9-5 19:56:00

B）相当于一个“治标治本”的问题，如果Aluminum 仅仅是个“ merely an effect of ”，即使用了药控制了Aluminum ，也不能cure the disorder，因为Aluminum不是病原，只是个症状而且。换句话说，控制了Aluminum ，这种disorder依然存在，只是可能以别的症状出现而已。
D）不对，因为文中的结论是“ cured of the disorder ”，不涉及是否有副作用或其它影响。

bigmouse · 发表于 2003-9-5 20:41:00

thanks for 心静！后来我也想明白了！其实D是个无关选项！但我为什么老是会犯这个低级错误！郁闷ing！

心静 · 发表于 2003-9-5 21:02:00

别太在意，下次小心点就OK了，我也会老犯糊涂的。：（

Help?LSAT Section4-III-5

Help?LSAT Section4-III-5

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