单选题
How many kinds of insects are helpful to people?
A、
[A] I don't think the story tells us.
B、
[B] All kinds.
C、
[C] You can count yourself.
【正确答案】
A
【答案解析】
[解析] 文中只列举了几种，而不是所有的益虫，所以选A。
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