GED24-Q35 没讨论过的题目~~~

美小波

 

Q13 GWD-24-35（CD-10-35）

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 on 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 milk 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.

答案是E,说chemical不单独影响胃口。

但前提中，说chemical block cannabinoids from reaching their receptons in the brain,然后说，cannabinoids's function is to affect appetite.

那么chemical 和 appetite 有直接关系么？

谢谢了！！

lijiahui0422

你想想 ，如果没有d 的assumption是不是会出现下面的情况

chemical 影响的 食欲，同时又block 了Can,但是Can的block其实对食欲没什么影响

所以推不出结论can 刺激了食欲

StanMarsh

  chemical 和 appetite当然有关系,如果是 chemical 直接影响 appetite 而不是通过阻碍 cannabinoid 来影响食欲, 那么结论就不成立了.

美小波

我明白了~~！！

但要是考试的时候。。。估计也就撞墙了。。。