单项选择题

Insects live ______.

A．in bushes
B．in the ground
C．on some animals
D．all of the above
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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.
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
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