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Light is registered in the retina when photons hit molecules of the pigment rhodopsin and change the molecules’ shape. Even when they have not been struck by photons of light, rhodopsin molecules sometimes change shape because of normal molecular motion, thereby introducing error into the visual system. The amount of this molecular motion is directly proportional to the temperature of retina.
Which one of the following conclusions is the most strongly supported by the information above?
(A) The temperature of an animal’s retina depends on the amount of light the retina is absorbing.
(B) The visual systems of animals whose body temperature matches that of their surroundings are more error-prone in hot surroundings than in cold ones.
(C) As the temperature of the retina rises, rhodopsin molecules react more slowly to being struck by photons.
(D) Rhodopsin molecules are more sensitive to photons in animals whose retinas have large surface aress than in animals whose retinas have small surface areas.
(E) Molecules of rhodopsin are the only pigment molecules that occur naturally in the retina.
这道题选B,原文我就没读明白，答案更是觉得很难选，哪位大侠能帮忙解答一下，不胜感激！ |
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发表于 2012-8-28 12:49:31
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