Limit the use of private cars, improve public transport and encourage the use of bicycles to control traffic congestion(拥挤) during the 2008 Olympics, experts from foreign countries advised Beijing on Friday. Professor Nigel Wilson, of the civil and environmental engineering department of Massachusetts Institute of Technology, said he was 'supportive to the limiting of private cars during the Olympic Games', saying that in foreign countries, the method is also adopted during big events, but he was unsure about the approach. The government planned to keep an average of more than one million cars off the roads to improve traffic flow during the Olympics, said Liu Xiaoming, deputy director of the Beijing Traffic Committee, at the China Planning Network First Urban Transportation Congress. Sharing Wilson's view, Dr. Yoshitsugu Hayashi, dean of the Graduate School of Environmental Studies of Nagoya University, believed the reduction in car use should be achieved not by banning, but through incentives . 'Drivers who don't use their private cars could be given points,' he said, 'and the points could be exchanged for goods from online shopping.' Wetzel stressed limiting the use of company cars. 'Governmental officials should also be encouraged to use public transportation or ride bicycles,' he said, adding that he himself is a bicycle-rider in London. Matthew Martimo, director of Traffic Engineering with Citilabs, said the bicycle was China's advantage. 'Limiting private cars is an idea worth trying but it is just a temporary solution,' he said. 'The real cause of congestion is high density of people in Beijing and many have cars.' Beijing, with a population of 15 million, is home to more than three million automobiles, and the number is rising by 1,000 a day. Professor Wilson said the Olympic Games was a great opportunity for Beijing to think about traffic problems and develop transportation, adding that the city had already been making public transport more efficient. Beijing has promised to stretch its 114-kilometer city railway to 200 kilometers before the opening of the Olympic Games. “We are looking forward to borrowing Beijing's experiences and drawing from its lessons in preparation for the 2012 Olympics,” said Wetzel. 51. The underlined word incentives in paragraph 4 means_______. A. something that encourages people to try    B. online shopping C. points could be exchanged for goods       D. award 52.It can be seen from the passage that ______. A. the government planned to forbid over 1 million cars to run on the roads during the Olympics. B. banning private cars is the best way to solve traffic congestion in Beijing C. Beijing now has 200 kilometers of city railway D. the use of company cars will not be limited 53. Why did Wetzel stress “ he himself is a bicycle-rider in London”? A. To limit the use of company cars. B. To encourage governmental officials to use public transportation or ride bicycles. C. To show that riding bicycles is good for health. D. To show that he loves riding bicycles. 54. Which of the following may be the reason for the traffic congestion in Beijing? A. The 2008 Beijing Olympic games. B. The number of cars in Beijing is rising by 1,000 a day. C. The large population in Beijing and the large number of cars. D. Public transport in Beijing is not efficient. 55. The purpose of the passage is ________. A. to limit the use of private cars, improve public transport B. to encourage the use of bicycles to control traffic congestion during the 2008 Olympics C. to borrow Beijing's experiences and draw from its lessons in preparation for the 2012 Olympics D. to tell the advice given by foreign experts on traffic congestion during 2008 Beijing Olympics