(26)B 第一段最后一句可得答案 其它选项都是否定,注意 few of 本身带有否定含义 (27)A第二段They show us shape (28)D 第二段“cones”. These help to see in a bright light and to tell the difference between colours.以及第三段第一句 (29)D 第三段最后一句Similarly cats and dogs cannot see colours as well as we can. (30)A 倒数第三行Some insects have favorite colours