With the rapid development of public transport system, big cities like Shanghai hope to e

With the rapid development of public transport system, big cities like Shanghai hope to ease the traffic jams and pollution caused by an increasing number of cars.
Statistics show that Shanghai’s subway lines will reach 350 km by the end of this year, making the city No. 3 in the world in terms of subway length. Shanghai could be ranked No. 1 when the length is extended to 430 km next May in time for the World Expo. This means about 5.5 million people each day could use the city’s subway system, thereby reducing traffic bottle-necks and air and noise pollution in downtown Shanghai.
At present, Shanghai suffers from severe traffic jams, during not only rush hours and weekdays but also off-peak hours and weekends.
For years, car emissions (尾气) have been blamed for contributing 60 percent of the air pollution in the city center, causing various respiratory (呼吸道) diseases.
What’s more, Shanghai has not met its target of noise reduction for five years, which has bee a major source of public plaints. Starting from August 1, cars that are considered highly polluting will be banned from entering the city centre.
Shanghai is also building 16 parking lots with 8,000 spaces near subway terminals so that people can park and ride the public system instead of driving their cars into the city center.
Much more needs to be done for truly easing the traffic jams and air and noise pollution caused by automobiles. For example, the ban on using the horn, which was made effective from June 1, 2007, has not really been carried out.
Many local people still regard owning and driving a car as a kind of demonstration(炫耀) of their wealth, without realizing the traffic and environmental hazards it can cause. When the subway system can take people to their destinations, driving a private car in downtown Shanghai could bee a moral issue.
45. The best title for the passage may be    .
A. Efforts to Ease Crowding & Pollution   
B. Results of Public Transport System
C.  Possibilities to Reduce Private Cars     
D. Ways to Reduce Car Emission
46. The following is true EXCEPT that Shanghai     .
A. Shanghai is building 16 parking lots for private cars in the city center
B. could be No. 1 in terms of subway length next May
C. has problems with crowding not only in rush hours
D. has strong public plaints about noise pollution
47. Guess the correct meaning of the underlined word “hazards”.
A. sudden changes       B. violent forces    
C. public dislikes      D. dangerous results
48. The writer intends to tell us     in the last two paragraphs. 
A. though many plans have been carried out, the situation is hopeless
B. difficult as the situation seems, Shanghai is sure to overe it
C. whether the problems will be solved depends on people’s action
D. environmental problem should be regarded as a moral issue.A