再问GWD29-40，请NN指教

mooncga

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?

 

1. After being administered to mice, naltrexone does not pass from the bloodstream into the intestine.
2. Naltrexone inhibits morphine from triggering the migration of intestinal bacteria into the bloodstream.
3. 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.
4. The increased risk of blood poisoning is not the only harmful effect on mice of being given morphine.
5. Conditions other than the presence of intestinal bacteria in the bloodstream can cause blood poisoning in mice.

看过以前的帖子，说B,C,E的都有，请大家帮忙解释一下到底选什么，为什么？谢谢！快考了，急啊！

aircavalry

没看过这道题的讨论，我个人认为选E才是weaken，原因如下：

E说除了presence of intestinal bacteria还有其他的condition能够造成blood poisoning，所以如果还有其他的condition可能造成blood poisoning的话，那就可以间接说明nalrexone不一定是toxic certain types of bacteria（intestinal bacteria），而有可能是摆平了其他的condition而使得mice没有中毒。

B不能成立，因为如果B成立，则否定了题目的条件although it does still occur。

C不能解释nalrexone是否可以toxic bacteria，也不成立。

mooncga

谢谢楼上！

wangming

这道题我觉得是B对吧？可是E也没什么错，不知道选什么。。。