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发布时间：2006-06-23 21:24     点击：

　　PASSAGE 16

　　Bees and Colour

　　On our table in the garden we put a blue card, and all around this blue card we put a number of different grey cards. These trey cards are of all possible shades of grey and include white and black. On each card a watch-glass is placed. The watch-glass on the blue card has some syrup in it; all the others are empty. After a short time bees find the syrup, and they come for it again and again. Then, after some hours, we take away the watch-glass of syrup which was on the blue card and put an empty one in its place.

　　Now what do the bees do? They still go straight to the blue card, although there is no syrup there. They do not go to any of the grey cards, in spite of the fact that one of the grey cards is of exactly the same brightness as the blue card. Thus the bees do not mistake any shade of grey for blue. In this way we have proved that they do really see blue as a colour.

　　We can find out in just the same way what other colours bees can see. It turns out that bees can see various colours, but these insects differ from us as regards their colour-sense in two very interesting ways. Suppose we train bees to come to a red card, and, having done so, we put the red card on the table in the garden among the set of different grey cards. This time we find that the bees mistake red for dark grey or black. They cannot distinguish between them. This means that red is not a colour at all for bees; for them it is just dark grey or black.

　　1. The experiment with bees described in the first and second paragraphs tell us that bees regard blue as a colour.

　　A. True

　　B. False

　　C. Not mentioned

　　2. The third paragraph tells us that bees also regard red as a colour.

　　A. True

　　B. False

　　C. Not mentioned

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