四．阅读理解。
（A）
Overhead bridges are found in many parts of. Beijing, especially in places where   traffic is very heavy and crossing the road is dangerous.
The purpose of these bridges is to enable pedestrians to cross roads safely. Over-   head bridges are used in very much the same way as zebra crossings. They are more ef-                                                       ficient although less convenient because people have to climb up a long flight of steps.   This is inconvenient especially to older people. When pedestrians use an overhead   bridge, they do not hold up traffic. However, when they cross a busy road using a ze-   bra crossing, traffic is held up, this is why the government has built many overhead   bridges to help pedestrians and to keep traffic moving at the same time.
The government of Beijing has spent a large amount of money in building these   bridges. For their own safety, pedestrians should be encouraged to use them instead of   risking their lives by dashing across the road. Old people, however, may find it a little   difficult to climb up and down the steps, but it is still much safer than walking across   the road with all the danger of moving traffic.
Overhead bridges serve a very useful purpose. Pedestrians, both old and young, should make it a habit to use them. This will prevent unnecessary accidents and loss of life.
1. What is the advantage （优点）of overhead bridges mentioned in this passage?
A. Taller trucks can pass under them.
B. Pedestrians can climb up and have a view of the city.
C. They are safer for pedestrians and can keep traffic moving at the same fame.
D. They are easier and more convenient for the pedestrians.
2. Which of the following statements is true according to the passage?
A. Overhead bridges are found in every part of Beijing.
B.Overhead bridges are only found in center of Beijing.                            C.Overhead bridges are found in many parts of big cities in China.                   D. Overhead bridges are found in places where traffic is heavy.                 
3.Theunderlined words a zebra crossing probably mean _______.                
A. a safe place across a road for pedestrians to walk across the road.
B. A wild animal from Africa that looks like a horse with broad dark brown and white stripes on its body
C. A safe place across a road for zebra to walk across the road
D. A safe place across a road for children to play a game.
4. What is the writer's attitude（态度） towards overhead bridge?
A. It is inconvenient for older people to walk across the road.
B. It is much safer for pedestrians thought climbing up and down the steps may be a little difficult.
C. An overhead bridge is more beautiful than a zebra crossing.
D. To build overhead bridges is the business of the government.