1、In the future, a city may have one billion people, yet it would not even seem crowded. Can you imagine why? Then lets see how Billion City works.It would be of three-dimensional, with many levels of activity. Todays cities operate largely on a single levelthe ground. The result is traffic jams, freq
2、uent accidents, and often unpleasant crowds of walking people. Billion City would have many levels, so that different transportation systems could work without getting in the way of each other. One level might be for walkers, another for electric automobiles （汽车）, a third for bicycles, a fourth for
3、high-speed automobiles, a fifth for buses and a sixth for subways. High-speed escalators （电梯）, and moving sidewalks would take people quickly from one level to another.By building the city both deep into the ground and high above it, there would be more room for far more people and everything else.
4、Air and water would be recycled all the time. As a result, air would be cleaner and the water would be purer than in todays cities.Soundproof walls would give people a quiet place and no noise would bother them.Electronic cameras would watch over the public areas so that there would be little crime.
5、All kinds of new technologies are becoming available to help solve city problems. And Billion City will be no doubt a great place to live in.1. By saying the underlined sentence “It would be of three-dimensional,” the author means _.A. people will develop more space above the ground in Billion CityB
6、. there will be few or even no traffic jams at all in Billion CityC. high-speed automobiles, escalators and side-walks will be used in Billion City D. Billion City will use the underground level, ground level and the air level for peoples activities2. To avoid air pollution, Billion City will _.A. s
7、et some special walls between people B. collect air and make it clean again all the time C. supply people with air and water D. use electric cameras to watch what people will do 3. Which is the best title for this passage?A. A Three-dimensional BuildingB. How to Live in the FutureC. Huge Cities in the Future D. The City at the Underground Level4. To provide people more room, the city would be built _.A. under the ground B. high in space C. in the bottom of the sea D. both A and BDBCD
