材料一　在20世纪的最后20年,在世界的东方,中国进行了一场卓有成效的社会变革,解放了思想的中国人焕发出蓬勃的创造力,书写了一个时代最为传奇的一页。

　——纪录片《复兴之路》解说词

材料二　邓小平作为***第二代领导集体的核心,邓小平理论第一次比较系统地、初步地回答了在中国这样落后的国家如何建设、巩固和发展社会主义的一系列问题。旗帜问题至关紧要。旗帜就是方向,旗帜就是形象,高举邓小平理论的旗帜不动摇。

阅读下面短文, 按照句子结构的语法性和上下文连贯的要求, 在空格处填入一个适当的词或使用括号中词语的正确形式填空。

    Itzhak Perlman is ____ famous violinist. He was born ____ 1945. He once gave a concert in New York City. Getting on stage was difficult for him ____ he is disabled. The audience sat ____ (quiet) while he made his way across the stage to ____ (he) chair. Then he picked up the violin, ____ (put) it under his chin (下巴) and started to play. But this time, when he finished the ____ (one) part, one of the ____ (string) on his violin broke. ____, he continued to ____ (play) the music. The music he played with three strings sounded even more wonderful than it was played with four strings.

在交通事故的分析中，刹车线的长度是很重要的依据，刹车线是汽车刹车后，停止转动的轮胎在地面上滑动时留下的痕迹．在某次交通事故中，汽车的刹车线长度是14m设汽车轮胎与地面间的动摩擦因数为0.7，取g=10m/s²，该路段限速为50km/h．（   ）