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
When millions of rods in our eyes are at work in darkness we call see
A．colours only
B．shapes and colours
C．shapes only
D．darkness only
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 tile 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
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