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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公共英语二级笔试

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