单项选择题

According to the passage, bats and adult owls cannot see colours ______ .

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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单项选择题
Among people who suffer from colour blindness, ______ .
A．some may see everything in shades of green
B．few can tell the difference between blue and green
C．few may think that red, orange and yellow are all shades of green
D．very few may think that everything in the world is in green
单项选择题
According to the passage, dogs and cats ______ .
A．as well as human beings cannot see some colours
B．have fewer cones than human beings
C．have less rods than human beings
D．can see colours as well as human beings
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