[解析]
(1)D.细节理解题.根据文章的句子 Flowers act as the insects' air﹣traffic controllers可知,蜜蜂是在花的指引下飞行的.故选D.
(2)B.细节理解题.根据文章第二段的句子Those clues can be in the color of petals,in the type,in the smell or even in the electrical charge.蜜蜂寻找花蜜最重要的线索的花瓣的颜色.故选B.
(3)D.细节理解题.根据文章第三段的句子 They started to guess that the strength of petals' indescence(色彩斑斓) might be related to how bees find the petals.他们假设花瓣色彩斑斓的程度可能和蜜蜂怎么找到花蜜有关,"hypothesis" 指的是"假设".故选D.
(4)C.推理判断题.根据倒数第二段的句子they found that bees felt confused sometimes when the petals were very iridescent and that bees had no problem finding the flowers with more nectar when the petals were not very iridescent.可知,不太浮华的花瓣更有利于蜜蜂做出调整.故选C.