Healthy lungs produce a natural antibiotic that protects them from infection by routinely killing harmful bacteria on airway surfaces.  eople with cystic fibrosis, however, are unable to fight off such bacteria, even though their lungs produce normal amounts of the antibiotic. The fluid on a0.irway surfaces in the lungs of people with cystic fibrosis has an abnormally high salt concentration; accordingly, scientists hypothesize that the high salt concentration is what makes the antibiotic ineffective.
Which of the following, if true, most strongly supports the scientists’ hypothesis?
答案选c,不知道d为啥错,各位帮忙看看
5-26 http://forum.chasedream.com/dispbbs.asp?BoardID=24&ID=69780
5-26 http://forum.chasedream.com/dispbbs.asp?BoardID=24&ID=69569
请楼主发问前先查看置顶贴里的讨论。。。其实很多题前辈们都已经讨论过了。
http://forum.chasedream.com/dispbbs.asp?boardID=24&ID=87513&page=1
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