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 oar eyes are at work in darkness we can see ______ .
A．colours only
B．shapes and colours
C．shapes only
D．darkness only
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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