Unit 24 Society第一部分 语言知识及运用(共两节,满分45分)第一节 完形填空(共15 小题;每小题2分,满分30分)阅读下面短文,掌握其大意,然后从1~15各题所给的A、B、C和D项中,选出最佳选项。What will the city of the future look like?No one knows for sure,and making predictions is a risky business.But one thing is __1__—they are going to get bigger before they get smaller.To find out what young people think about the future of urban life,a teacher at a university in Texas i