2. 考研
  3. A nocturnal(夜间活动的)moth has become the first animal known to see colours in the dead of night. The moth uses this visual talent t

A nocturnal(夜间活动的)moth has become the first animal known to see colours in the dead of night. The moth uses this visual talent t

admin2010-01-13  58
问题    A nocturnal(夜间活动的)moth has become the first animal known to see colours in the dead of night. The moth uses this visual talent to find yellow, nectar-packed flowers in the dark, but the finding suggests that other, species also use colour vision at night.
   Nocturnal moths were thought to find flowers by looking for bright petals against a darker, leafy background. This difference in brightness explains why a yellow flower stands out from green leaves on a black and white photo.
   To test this idea, researchers at Lund University in Sweden trained nocturnal elephant hawkmoths(豆天蛾)to pick out yellow or blue artificial flowers from eight other flowers of varying shades of grey. They then made moths perform the trick in conditions as dark as a starry but moonless night.
   The researchers expected the moths to do badly, but to their surprise the insects picked the correct flower 90 per cent of the time. But the moths could not distinguish between lighter and darker shades of a coloured flower, even though they could still tell both from grey. "This tells us it’s not a brightness-related cue,” says Almut Kelber, the sensory biologist leading the Lund team. "They could only have used the spectral(光谱的)composition of the signals—which we call colour."
   The moths use three separate colour receptors: blue, green and ultraviolet. At night, that leaves so little light per receptor that the insects should be almost blind. But hawkmoths have a host of adaptations to compensate. One is a mirror-like structure at the base of the eye, which reflects the light across the photoreceptors for a second time. The structure of the compound eye also allows each facet to supplement the light that strikes it with light from as many as 600 others.
   Kelber suspects that many other insects, and some higher animals, also use colour vision at night. She plans to look for the ability in nocturnal frogs and toads that use colour to choose their mate. "Why not? she asks. "At night there are just as many colours as during the day."
Kelber believes that nocturnal frogs and toads ______.
选项 A、belong to higher animals
B、use color to attract mates
C、are of many different colors
D、are unable to see color at night
答案A
解析  文中第5段说蛾有3个独立的颜色接收器，在眼睛底部有一个像镜子一样的组织。所以答案选C。另外虽然本文一直在描述蛾是如何在夜间看到花朵的，但并没有提到他们白天如何，所以选项A、B、D都不对。
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