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
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单项选择题
The story does not say this, but from what we have read, we can tell that ______.
A．fruit trees do not need help from insects
B．praying mantis always lives in a house
C．some people know nothing about insects
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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