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
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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 men.
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, which of the following has changed the most in the last 500 years
A．Food.
B．Clothing.
C．Ideology.
D．Language.
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