单选题
Subways are underground trains, which usually operate 24 hours a day. They are found in larger 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-operated buses run on various routes (线路) 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 the fare before you agree to ride. The taxi drivers usually expect a tip (小费) of 15 percent of the fare.
单选题
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
【正确答案】
D
【答案解析】[解析] 细节题。根据第一段第二句“...usually run between the suburbs and the downtown area”可以知道，地铁通常往返于郊区和市区之间。其中选项D中的“city centers”是对原文内容“downtown area(市区)”的同义替换。
单选题
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 offices
【正确答案】
D
【答案解析】[解析] 细节题。本题询问你可以在什么地方获得地铁的行程和列车时刻表。根据第一段第三句“Maps and schedules are available from the ticket office.”可知，乘客可在售票处获得。故选项D为正确答案。
单选题
From the passage we 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
【正确答案】
C
【答案解析】[解析] 推断题。本题询问根据短文内容，下列哪项是正确的。选项A与短文第二段第三句“Buses run mainly during the day”内容不符；选项B与短文第二段最后一句“fare is paid by exact change in coins, or by monthly passes”不符，公交车乘客可以用硬币支付车费也可用月票，故选项C为正确答案；选项D在原文中未提及。
单选题
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
【正确答案】
B
【答案解析】[解析] 细节题。根据第三段第二句话“...be sure you ask the amount of the fare before you agree to ride”可知，乘坐出租车之前最好先问清车费，故选项B为正确答案。
单选题
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