单选题
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
【正确答案】
A
【答案解析】
[解析] 文中谈到了害虫和益虫，所以选A。
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