2. 外语
  3. Despite the extravagant colors of the flowers bees visit, until the early 1900s it was commonly thought that bees were entirely

Despite the extravagant colors of the flowers bees visit, until the early 1900s it was commonly thought that bees were entirely

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问题     Despite the extravagant colors of the flowers bees visit, until the early 1900s it was commonly thought that bees were entirely color-blind. To test this, zoologist Karl von Frisch set out an array of dishes on cards. The dish on one card, the only blue card among varying grays, contained sugar water. Once bees learned to visit this card and dish combination, he varied its position in the matrix. Next, he replaced all the cards and dishes with a new set of identical materials, only now leaving the blue card’s dish empty. The bees nonetheless returned to the blue card. If their vision were monochromatic, they would likely have found at least some of the gray cards indistinguishable from the blue.
It can be inferred from the passage that by setting out new cards when replacing the dish of sugar water with an empty one, von Frisch
选项 A、was able to record accurately any changes in color that resulted from spills or drops
B、could subtly alter the color of the card on which the sugar water was placed in each iteration of the experiment
C、introduced new clues relevant to finding the sugar water’s location
D、succeeded in proving that bees see in only in a limited spectrum of color
E、was able to rule out the possibility that the bees had somehow marked the blue card in previous trials
答案E
解析 根据第五句，用全新的材料取代之前的材料的目的就是排除蜜蜂在之前的材料上留下痕迹这一因素，因此选项E正确。A、B、C这三项都引入了新的变量，违背了本文控制变量的基本原则。D项本实验最终反驳了蜜蜂是色盲，表述相反。
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