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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单项选择题
The main idea of the whole story is that ______.
A．some insects hurt us and some insects help us
B．silkworms make silk while bees make honey
C．farmers like to spray insects in their fields
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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