恐龙
恐龙6000万年前在地球上生存.这比人类生存的时间长久的多.有树百万的恐龙.它们生活在每处.一些和鸡一样大,还有的有10头大象那么大.一些恐龙有翅膀并可以飞翔.
许多恐龙都没害处.他们像睡觉一样温和且吃植物.另一些是有伤害性的.它们比老虎更凶猛而且吃肉,不像其他大多数恐龙.
恐龙突然全部死亡,没人知道为什么.我们从它们的骨架,蛋和足迹来了解它们的消亡之前的事（看地球历史）
DinosaursDinosaurs lived on earth more than sixty million ye
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