阅读理解。Doyouliveinacity?Doyouknowhowcitiesbegan?Longlonga...
问题详情：阅读理解。Doyouliveinacity?Doyouknowhowcitiesbegan?Longlongago,theworldhadonlyafewthousandpeople.Thesepeoplemovedfromoneplacetoanother.Theymovedovertheland,huntinganimalsforfood.Nooneknowshowo...