Subways are underground trains, which usually operate hours a day. They are found in large cities and usually run between the suburbs and the downtown area. Maps and schedules are available from the ticket office. If you take the subway often, you can save money by purchasing a monthly pass. (月票) City-operate buses run on varies routes (路线) and are designed to be at certain places at certain times. Maps and schedules may be posted at certain stops, or they may be available at local banks, libraries, the student union, or from the bus drivers. Buses run mainly during the day. Fare is paid by exact change in coins, or by monthly passes. Taxis are generally more expensive in the United States than in other countries. If you use a taxi, be sure you ask the amount of fare before you agree to ride. The driver usually expects a tip (小费) of 15 percent of the fare. 1. According to the passage, subways are underground trains, which usually run _______. A. within downtown areas B. away from city centers C. in or outside big modern cities D. between suburbs and city centers 2. You can get the maps and schedules of the subways _______. A. at bus stations B. at local banks C. in any bookstores D. from the ticket office 3. From the passage we can learn that _______. A. buses are always available in 24 hours B. bus riders have to buy monthly passes C. bus fare is paid by exact change in coins D. buses are the best means of transportation 4. When you take a taxi, you'd better _______. A. buy a monthly pass B. ask about the fare first C. agree on the amount of the tip D. pay by the exact change in coins 5. The passage mainly tells us about _______. A. the bus and train fares in the US B. the ways of paying a taxi in the US C. the public transportation in the US D. the advantage of subways in the US