标题: 求助阅读题一道 36套 exercise 24 [打印本页] 作者: qiuj 时间: 2012-4-13 01:01 标题: 求助阅读题一道 36套 exercise 24 Why during sickness should body temperature of warm-blooded animal rise? It has long been known that the level of serum iron in animals falls during infection. Garibaldi first suggested a relationship between fever and iron. He found that microbial synthesis of siderophores -- substances that bind iron -- in bacteria of the genus Salmonella declined at environmental temperatures above 37°C and stopped at 40.3°C. Thus, fever would make it more difficult for an infecting bacterium to acquire iron and thus to multiply. Cold-blooded animals were used to test this hypothesis. Kluger reported that of iguanas infected with the potentially lethal bacterium A. hydrophilia, more survived at temperatures of 42°C than at 37°C, even though healthy animals prefer the lower temperature. When animals at 42°C were injected with an iron solution, however, mortality rates increased significantly.
10. If it were to be determined that similar phenomena occur in warm-blooded animals, which of the following, assuming each is possible, is likely to be the most effective treatment for warm-blooded animals with bacterial infections? (A) Administering a medication that lowers the animals' body temperature (B) Injecting the animals with an iron solution (C) Administering a medication that makes serum iron unavailable to bacteria (D) Providing the animals with reduced-iron diets (E) Keeping the animals in an environment with temperatures higher than 37°C 答案选C 哪位大侠帮忙解释一下 谢谢！～～作者: Caroline89 时间: 2012-4-18 17:23
文中的Thus 引导的那句话取非，得到bacteria 由于得到iron而飞速繁殖。 所以如果想要抑制这些bacteria,we need to make iron unavailable to them. 因此是C