单项选择题

How many kinds of insects are helpful to people

A．I don't think the story tells us.
B．All kinds.
C．You can count yourself.
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单项选择题
Bees make ______.
A．silk
B．fruit
C．honey
单项选择题
A good title for this article could be ______
A．Are ail insects harmful
B．Which insects are harmful
C．Harmful insects.
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