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
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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
单项选择题
According to the passage, dogs and cats,
A．as well as human beings can not 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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