星期天,爸爸妈妈带着小京京到香山去春游。刚一下车,就见天空中飞过来一队北归的大雁,小京京问爸爸:“鸟为什么会飞?妈妈平常总说我象只小鸟,可我为什么不会飞呢?”爸爸看他这样爱动脑筋,就耐心地给他讲了起来: 鸟为什么会飞? 鸟儿会飞的头一个条件就是有翅膀。你看,老鹰的翅膀有力地扑搧时,它就腾空飞起来了。小燕子、小麻雀要想飞的时候,也得拍拍翅膀。再就是鸟有羽毛。它是鸟飞翔必不可少的工具。鸟的羽毛非常轻, Sunday, Mom and Dad with a small Beijing to Xiangshan to spring. Just got out of the car, see the sky flew a group of north goose geese, small Beijing asked Dad: “why the birds fly? Mother always said I always like a bird, but why I will not fly it?” Dad saw him so brains, patiently told him: why birds fly? The first condition the birds will fly is the wings. You see, when the wings of the eagle forcefully fan the air, it flies to fly. Swallow, little sparrow want to fly, they have to pat the wings. Then the birds have feathers. It is an indispensable tool for bird flying. Bird's feathers are very light,