逻辑 JJ 求讨论

zhangfanna

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.

luoweijia0511

答案是？

zhangfanna

B  E  徘徊中

paonbleu

结论是nal对b有toxic，前提是m导致b进入血液里面造成poison，对比m+nal的结果poison减少，整个argument是从一个比较得出的结论
A nal不会进入intestine 无关
B nal阻止b进入血液  他因削弱，nal对b的作用不是toxic。
C 比较有nal没M和没nal没M的情况  整篇都在讨论有M的情况，无关
D poison是M的唯一害处。    无关
E 他因导致poison      无关。结论是nal和b之间的关系，E能削弱的结论是M导致poison，不是本篇结论。