弱弱問GWD-TN-20 Q15

kelalalar

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.

E是哪里错了？B是哪里对了？

sunjin1988

很明显他因削弱啊 B强调N这个东西只是阻止了M引起的病毒进入血液里  并不是turn out to be toxic to certain types of bacteria.

作者的观点bacteria that normally reside in the intestine typically respond to morphine by migrating into the bloodstream 现在明白了吗？？

E是无关的 作者的reasoning是认为N这个东西起到杀死bacteria的作用 我们就要推翻这个结论！！             B选项就说明了这一点
naltrexone只是阻止bacteria进入血液循环中而已

[此贴子已经被作者于2009/10/19 11:26:51编辑过]