单项选择题

Which of the following is not true

A．The number of insects are larger than that of any other kind of animals.
B．Silk worms and bees are useful insects to man.
C．Insects are of no value to people.
D．Insects live in all kinds of ways.

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单项选择题

Silk worms and bees are ______ , while flies and mosquitoes are ______.

A．beneficial insects... pests
B．pests... beneficial insects
C．harmful to people... helpful to people
D．helpful to people... helpful to people too

单项选择题

Which of the following is not true

A．When they grow up, insects look the same as when they are young.
B．Insects keep changing during their growth.
C．Insects have different shapes.
D．Not all insects look the sam