以下是引用ly365在2006-7-11 16:30:00的发言: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?
- After being administered to mice, naltrexone does not pass from the bloodstream into the intestine.
- Naltrexone inhibits morphine from triggering the migration of intestinal bacteria into the bloodstream.
- 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.
- The increased risk of blood poisoning is not the only harmful effect on mice of being given morphine.
Conditions other than the presence of intestinal bacteria in the bloodstream can cause blood poisoning in mice. 答案B,我选E 请教 我是这样想的,前面说的是,M单独使用,会使bloodstream中毒; 然后是:M和新药一起使用,虽然还会中毒,但是没那么频繁了。 所以猜测,是不是新药对于引发中毒的细菌有toxic的效果。 削弱:新药只是inhibit,并不是toxic。 楼上好几位说的是一个意思。查了下,血中毒就是败血症的意思。 |