词根: thesis =to put,place,表示"放,引申为论文,观点"
1 His new hypothesis gives a possible reason for the change of the weather.他的新假说提出气象变化的一个可能的原因。
2 Her study is based on the hypothesis that language simplification is possible.她的研究基于语言可以简化这样一个假说.
3 We have proved the hypothesis./p> 我们已经证明了这种假设.
4 Her hypothesis concerns the role of electromagnetic radiation.她的假说涉及到电磁辐射的作用.
Healthy lungs produce a natural antibiotic that protects them from infection by routinely killing harmful bacteria on airway surfaces. People with cystic fibroses, however, are unable to fight off such bacteria, even though their lungs produce normal amounts of the antibiotic. Since the fluid on airway surfaces in the lungs of people with cystic fibrosis bas an abnormally high salt concentration, scientists hypothesize that in high salt environments the antibiotic becomes ineffective at killing harmful bacteria.
Which of the following, if it were obtained as an experimental result, would most decisively undermine the scientists’ hypothesis?