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知了是益虫还是害虫它以什么为食

更新时间: 2020-09-26 00:00:00     

知了是害虫,它以植物根部的汁液为食,知了一般指蝉,蝉生活于世界温带至热带地区,一些分布于沙漠地区的种类,当体温过热时,会排出多余的水分,进而达到冷却及散热的效果。

害虫,顾名思义,即有害的虫子,是人类对一些虫类动物的定义,与益虫相反,主要分为昆虫类与非昆虫类,且种类与数量繁多。

关键词: 知了 益虫 还是 害虫 什么

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