这个是5A课本上的啊，讲得是大雁搬家的。Wild geese change ( thteir homes ) twice every year .in spring ,they fly to the (North ) in autumn,they fly to the ( South ) .they live there in ( winter) . they can't find enough food in the north in winter . (When) springcomes,they (miss) their hom in the north and fly (back )
具体参照你们的课文，这个是原文，可以找到的。谢谢
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