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  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

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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.
Which of the following statements is true?
选项 A、Developing fever is the privilege of warm-blooded animals, so sick lizards can not run a fever.
B、Invertebrates also have the ability to raise their temperature.
C、The internal temperatures of warm-blooded creatures are independent of the weather, so are the cold-blooded animals.
D、Sick lizards move into the sun to develop fever.
答案B
解析 A “发烧是恒温动物的特征，因此，生病的蜥蜗不可能发烧。”整篇文章都在阐述冷血动物的发烧，这一选项显然不对。C “恒温动物的体表温度独立于气温，冷血动物也是这样”，冷血动物的体表温度随气温的变化而变化，C 错误。D “生病的蜥蝎为了发烧挪动到太阳底下”，文中所说的是，蜥蜴为了增加体表温度而挪动到太阳底下。只有B “无脊椎动物也增加体温的能力”与文中第二段的意思一致。故应选B 。
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