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.