閲讀理解。Doyouliveinacity?Doyouknowhowcitiesbegan?Longlonga...
問題詳情：閲讀理解。Doyouliveinacity?Doyouknowhowcitiesbegan?Longlongago,theworldhadonlyafewthousandpeople.Thesepeoplemovedfromoneplacetoanother.Theymovedovertheland,huntinganimalsforfood.Nooneknowshowo...