19．You may ride on your bicycle in a rush to get to school every morning．You may fight to get a bit of space on a bus or on the subway．You may also watch taxis crawl their way through traffic jams．No matter where you are，all big cities around the worl have traffic jams these days．But although they all have their problems，many cities also have a type of transport that has become a cultural icon （文化标识）．In London to avoid the traffic above ground，people use the"underground"，also called the"Tube"．The city has the oldest and most complicated underground railway system in the world and is the pride of many Londoners．With 12lines and 275stations across the city，the Tube，is normally the quickest and easiest way of getting around London．In London，you are never far from a Tube station．New York is famous for its Yellow cabs．They serve as a quick and easy way of getting across Manhattan，where the subway doesn't take you everywhere．Stopping a cab is easy； just stick out your arm like you do in any city．But，with over 12，000yellow cabs in the Big Apple，they also cause traffic jams．Since 1873when the first cable car started public service，the slow and noisy vehicle has been a symbol of San Francisco．Although once damaged by a serious earthquake and challenged by cars，it is never caught in traffic jams and provides better views than the subway．But there are no such symbols in Los Angeles．If you visit you'd better rent a car．The city's public transportation is terrible．It can take hours to get across town by bus．The subway covers just a small part of the city centre．The light rail line only runs between the Long Beach hotel area and the city centre．That's why Angelenos love their private cars more than any other people in the world．
21．If you have a chance to London and want to avoid the traffic jam，you'd betterC．
A．ride vehicle
B．take a taxi
C．use subway
D．rent a car
22．Which type of transportation has become a cultural icon of the Big Apple？D
A．Noisy vehicle
B．Cable cars
C．Subway
D．Yellow cabs
23．People in Los Angeles like to hire private cars because of the following except thatB．
A．the public transportation is terrible
B．it is not expensive to take a private car
C．the underground railway covers a small part of the city center
D．people have to spend hours getting across Los Angeles
24．The passage mainly tells usA．
A．how big cities in the foreign countries keep on moving
B．how people in the city avoid the traffic jams
C．why London has the oldest and complicated subway
D．why people call New York the Big Apple．
