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 same.

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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

Insects live ______.

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