[问答题]
The question is based on thl w(tx1fp +.eg8 u4v w5r,fjylexq/8hs5 gf8d +4 p(czxah: ofz first passage you have just heard.
参考答案: They help farmers keep diseases in check.
Many species remain unknown to scientists.
Only a few species cause trouble to humans.
They live in incredibly well-organized colonies.
