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
All work and no play makes Jack a dull boy. Here dull means foolish.
A．Right.
B．Wrong.
C．Doesn't say.
单项选择题
If we want to be healthy and enjoy life, we should not only work hard but also have recreation.
A．Right.
B．Wrong.
C．Doesn't say.
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