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题目内容
（湖南大学-大学英语2）
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
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
参考答案