作者:康俊民friendskilledhappeneatingpassagesomeoneasked
摘要:<正>Passage1Not many years ago,some farmers wereworried because hawks(鹰)were taking manyof their chickens.The farmers killed manyhawks.Before long they didn’t have to worryabout their chickens.But they had a new wor-ry.Field mice were eating up a lot of farm-ers’grain.How did this happen?Hawks eat not only chickens but
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