2. 外语
  3. Insects live ______. Silk worms and bees are ______ , while flies and mosquitoes are ______.

Insects live ______. Silk worms and bees are ______ , while flies and mosquitoes are ______.

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问题 Insects live ______.
Silk worms and bees are ______ , while flies and mosquitoes are ______.
选项 A、beneficial insects... pests
B、pests... beneficial insects
C、harmful to people... helpful to people
D、helpful to people... helpful to people too
答案A
解析
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