GWD-29-Q40 一道逻辑 请NN帮帮忙解答~

maple0918

 GWD-29-Q40
    

•Mice that have been given morphine are very likely to develop blood poisoning because bacteria that normally reside in the intestine typically respond to morphine by migrating into the bloodstream.  However, when mice are given both morphine and the new drug naltrexone, blood poisoning is much less frequent, although it does still occur.  These results provide support for researchers’ prediction that naltrexone will turn out to be toxic to certain types of bacteria.

•Which of the following, if discovered to be true, would most seriously weaken the support for the researchers’ prediction?

A.After being administered to mice, naltrexone does not pass from the bloodstream into the intestine.

B.Naltrexone inhibits morphine from triggering the migration of intestinal bacteria into the bloodstream.

C.Mice that have been given naltrexone but not morphine have no greater risk of developing blood poisoning than do mice that have not been given either substance.

D.The increased risk of blood poisoning is not the only harmful effect on mice of being given morphine.

E.Conditions other than the presence of intestinal bacteria in the bloodstream can cause blood poisoning in mice

Conditions other than the presence of intestinal bacteria in the bloodstream can cause blood poisoning in mice

答案是B，我第一次选B第二次选C，觉得C不是更直接驳斥prediction吗？

[此贴子已经被作者于2008-11-11 21:27:45编辑过]

午后的绵羊

选B不就是对了么..

maple0918

哦~打错了 第二次选C...

午后的绵羊

话说文章中由

 条件1:M能够带来细菌产生血液毒素

 条件2: M和N一起使用时细菌减少

 推断: N能够杀菌

这个推断不充分阿

 因为N可能根本就不能杀菌，它的出现导致细菌出现减少的原因可能仅仅因为它控制了细菌的扩散或者是抑制了细菌的活性

所以B正确

午后的绵羊

C选项的出现对于假设的驳斥没有什么

假设的观点是关注在N的出现是怎么导致细菌减少的结果的，Ｃ选项就无关了

lala974

原题结论：N能起到杀死某类细菌的作用。

问削弱
B：N并不能杀菌，只是起到防止细菌进入血管的作用。