请教GWD-24-35

miaoyin_tx

24-35: The milk of many mammals contains cannabinoids, substances that are known to stimulate certain receptors in the brain. To investigate the function of cannabinoids, researchers injected newborn mice with a chemical that is known to block cannabinoides from reaching their receptors in the brain. The injected mice showed far less interest in feeding than normal newborn mice do. Therefore, cannabinoids probably function to stimulate the appetite.

Which of the following is an assumption ok which the argument depends?

A)    Newborn mice do not normally ingest any substance other than their mothers’ milk.

B)    Cannabinoids are the only substances in mammals’ milk that stimulate the appetite.

C)    The mothers of newborn mice do not normally make any effort to encourage their babies to feed.

D)    The mild of mammals would be less nutritious if it did not contain cannabinoids.

E)    The chemical that blocks cannabinoids from stimulating their brain receptors does not independently inhibit the appetite.

我觉得这题选B，答案是E，请教一下各位大侠，多谢。

leeon

B is a typical wrong answer in logic questions.

B points out CB are the only substances to stimulate the appetide. If B is not true, that is, there are other substances can stimulate the appetide. The conclusion is still validate as long as CB can stimulate the appetide. So B is not correct.

E is the answer for it rule out other reason cause the result of the experiment.

miaoyin_tx

Thanks a lot. I read the question twice and then found B was definately wrong

Levy

以下是引用leeon在2004-10-21 11:33:00的发言：

B is a typical wrong answer in logic questions.

B points out CB are the only substances to stimulate the appetide. If B is not true, that is, there are other substances can stimulate the appetide. The conclusion is still validate as long as CB can stimulate the appetide. So B is not correct.

E is the answer for it rule out other reason cause the result of the experiment.

I agree with what you said about B. But if you are right with E, the answer, i think, should read like this "The chemical ......does not dependently inhibit th appetite, or The chemical .. indepently ....  please reply this, thanks.

paopao

想了半天没明白为何E对 我选的是C 排除其它原因

leeon

原文：给老鼠注射抑制C到达大脑的化学物质老鼠的食欲降低－C刺激食欲。

E说抑制C到达大脑的化学物质不能单独抑制食欲。如果单独的抑制了食欲。那么老鼠的食欲降低就和是否C物质时候刺激食欲无关了。

pinkrouge

why C is wrong?

薰衣紫草

Yeah, why c is wrong?

lawyer_1

C所说的newborn mice 的mothers鼓不鼓励它们feeed和原文的实验一点关系都没有。你将C取非，就说MOTHERS鼓励BABIES吃啦，原文结论一样成立。其实原文结论是因果型结论。E排除另外产生该结果的可能性原因。

薰衣紫草

But if mothers encourage babies to feed, we could reach the conlcusion that the encouragement, rather than cannabinoids, stimulates the feeding. This conclusion weakens the argument, doesn't it?