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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单项选择题

Which of the following is not true about insects

A．Insects can see more colours than human beings.
B．Insects can see ultraviolet rays which are invisible to man.
C．All insects have their favorite colours.
D．The world is more colorful to insects than to human beings.

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