题目

在“探究小车速度随时间变化的规律”的实验中，如图1所示为一条记录小车运动情况的纸带，舍掉开头比较密集的点迹，在后面便于测量的地方找一个点做计时起点0，后面每隔4个点取一个计数点，交流电的频率为50HZ ． （1） 在实验中，使用打点计时器操作步骤应先再（填“释放小车”或“接通电源”）； （2） 试根据所提供的纸带，每隔0.10s测一次速度，算出包含各计数点0、1、2…附近各段的平均速度 ，把它当作打点计时器打下这些A superstar is someone who is usually famous in sports, or films, or popular music, someone like the singer Michael Jackson. In the nineteen eighties, Michael Jackson made a record album called “Thriller”. It quickly became the most popular recording in the history of music and it made Michael Jackson a superstar. The word “super” means more than usual or very wonderful. And of course, a star is a person who is very famous. So people who are famous and skillful in sports, films or music are called superstars, such as Li Ning. One of the most famous sports superstars in the United States is the boxer（拳击手） Muhammad Ali. After he won a gold medal in the Olympics and became the heavyweight boxing champion, he was known as one of the greatest and most famous boxers in the sports history. At that time Muhammad Ali was even better known than the president of the United States. He was a true superstar, nearly everyone knew his name. But like the stars in the sky, a superstar may fade away（褪色） as the years go by. These days people know little about Muhammad Ali. Superstars, loved by millions of people today, and may be forgotten tomorrow. 34. According to the author which of the person is NOT a superstar? A. Michael Jackson　　　 　 B. Abraham Lincoln C. Muhammad Ali 　 D. Li Ning 35. According to the passage, what would happen to superstars at last? A. They will be remembered by millions of people. B. They will become the most important people in history. C. They will be loved only by young people. D. They will be little known as time passes by. 36. Today few teenagers know about Muhammad Ali, because______. A. he isn’t as famous as other superstars B. he had already disappeared in the world C. he is like a star fade away quickly D. he isn’t skillful enough in boxing 37.Millions of people today love superstars because ______. A. superstars are very beautiful and cool in appearance B. the superstars are greater than anyone else in all the fields C. they will be known little by the world in the future D. they are very famous and skillful in some special field