一道逻辑机经题的疑问

suntao0209

3.2 GWD

Mice that have been given morphine [i1]are very likely to develop blood poisoning[i2] because bacteria that normally reside in the intestine[i3]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.

选B

个人感觉因该是A或C  B起其支持作用的
   求讨论







[i1]morphine ['m?:fi:n]
基本翻译
n. [毒物][药] 吗啡
网络释义
Morphine:吗啡 | 吗 | 么啡
百科
morphine
吗啡（morphine）吗啡是鸦片中的主要生物碱，１８０６年为德国化学家Ｆ．Ｗ．Ａ．泽尔蒂纳分离出。作为鸦片的主要有效成份，吗啡在鸦片中含量为百分之七至十四。由于纯度关系，吗啡的颜色可呈白色、浅黄... 详细 »
搜索morphine


[i2]blood poisoning
基本翻译
n. 败血症；血中毒
网络释义
blood poisoning:败血病 | 败血症 | 血液中毒


[i3]intestine [in'testin]内部的 | 肠子 | 国内的

灭绝湿太

B是提出他因。

argument说由于肠道内存有对吗啡有反应的细菌，导致细菌流入血液，带来败血症。使用了新药后，败血症发生频率减小，因此认为新药对与某种细菌具有毒性。

B说新药的功能是防止吗啡引发细菌流入血液，从而减少发病。而不是argumen的结论因为新药对某种细菌有毒才发生效果。所有是削弱！~

A ，即使药不流入肠道，还是可以杀死存在血液中的细菌，从而减少败血症发病。

C是无关。