A. It is a flashback of the tall buildings. B. It is about the history of skyscrapers. C. It is a comparison of skyscrapers. D. It is a description of a skyscraper rac 参考答案:D 答案解析:根据提问,第三段里主要讲述了大楼一栋比一栋造得高。再有结尾的一段首句又提到了竞争: The race was getting very competitive。