2. 外语
  3. Running a fever was once thought to be the prerogative of warm-blooded creatures, whose internal temperatures are independent of

Running a fever was once thought to be the prerogative of warm-blooded creatures, whose internal temperatures are independent of

admin2010-07-06  74
问题      Running a fever was once thought to be the prerogative of warm-blooded creatures, whose internal temperatures are independent of the weather. But, as Matthew Kluger reported in "The Importance of Being Feverish" January 1976, lizards can also develop fevers, even though there is no question that they are cold-blooded. They raise their temperatures by moving into the sun or, in the case of Kluger’s experiments, under a sun lamp. And it seems to do them some good. Sick lizards kept in cages at feverish temperatures fare much better than their counterparts in normal and cool environments.
     Now ,fever has spread to invertebrates(无脊椎动物). Recent studies have shown that crayfish and scorpions can develop fevers. Crayfish injected with bacteria and scorpions injected with prostaglandins (前列腺素)swam and scuttled to hot areas. Prostaglandins are hormones thought to be instrumental in the development of a fever.
     Evidence is also mounting that moderate fevers have their benefits, which might explain why the fever process is so widespread. Leukocytes, white blood cells that are active in fighting bacterial infections, are more mobile at febrile temperatures. And fevers reduce the amount of iron available to bacteria. That reduction, combined with high temperatures, has been shown to inhibit bacterial growth.
Fevers cause______.
选项 A、prostaglandins to be formed
B、iron to be made available to bacteria
C、leukocytes to be more mobile
D、lizards to be cold-blooded animals
答案C
解析 发烧会导致什么后果?A “形成前列腺素”，颠倒了因果关系，前列腺素的形成会导致发烧，而不是相反。B 与文中“And fevers reduce the amount of iron available to bacteria”的意思刚好相反。 D “使白细胞更加活跃”与文中的“Leukocytes，white．．．temperatures”一致，是正确选项。
转载请注明原文地址:https://www.kaotiyun.com/show/byDd777K
本试题收录于： 公共英语四级笔试题库公共英语（PETS）分类
0

公共英语四级笔试

公共英语（PETS）

相关试题推荐
随机试题
最新回复(0)