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?
原文：morphine会导致在肠道里的细菌转移进血液，从而blood poisoning. 如果morphine+naltrexone一起用，blood poisoning概率缩小。由此推出：naltrexone可以消灭细菌。
A：naltrexone没有进入肠道，无法削弱，因为无关，而且就算不进入肠道，进入血液也可以把细菌杀死
B：正确。Naltrexone会抑制morphine导致细菌迁移血液。原文说的是Naltrexone会直接消灭细菌，这里提出了另一个观点，是间接达到这个目的的，属于他因削弱。
C：只有Naltrexone没有吗啡的老鼠们与既没有N也没有吗啡的老鼠们发生blood poisoning的概率一样，无关
D：得BP不是唯一一个由吗啡导致的对老鼠们有害的风险，无关。
E：有其他因素也能导致血液中毒。原文并不是想讨论还有没其他因素 原文只是想讨论N这个东西对阻止病毒有没有用
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