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 best states the main idea of the passage?
A.Cold-blooded animals can develop fevers.
B.There are benefits to developing fevers.
C.Fevers inhibit bacterial growth.
D.Lizards can develop fevers.
第1题
显示器的什么指标越高,显示的图像越清晰()?
A.对比度
B.亮度
C.对比度和亮度
D.分辨率
第2题
显示器的什么指标越高,显示的图像越清晰?()
A. 对比度
B. 亮度
C. 对比度和亮度
D. 分辨率
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