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.

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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

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