13. According to the passage, bats and adult owls cannot see colors. A. because they hunt at night B. because they cannot see light C. because they have no cones and rods D. because they have no cones

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题目内容（大学英语第二册）

13. According to the passage, bats and adult owls cannot see colors.
A. because they hunt at night
B. because they cannot see light
C. because they have no cones and rods
D. because they have no cones

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广西师范大学-中国古代文学史