第27题: [单项选择]What would be the best title for the text A. Alice Cities — Cities of the Future B. Space Travel with H. G. Wells C. Enjoy Living Underground D. Building Down, Not Up 参考答案:D 答案解析:[解析] 纵贯全文说的是将建筑物建在地下,让地面有足够的空间进行绿化。因此,本文标题以Building Down,Not Up为佳。