The London Underground （The Tube） The main source of public transport in London revolves around the Underground （or the Tube as it is known to Londoners）．This network of 12 lines can get you to most places in the center of the city quickly．
   It's almost necessary to get an Oyster Card or a Travelcard．Single tickets are priced starting at the intentionally absurd（荒謬的）price of ￡4.80（Zone1-3），if you pay cash．Using an Oyster Card，a single fare is ￡2.30 if you are traveling within the central Zone 1．
   On hot days it is also advisable to take a bottle of water with you as Underground trains are not air-conditioned．
   Last trains leave central London at around 00：30 weekdays，23：30 Sundays．First trains leave the suburbs at around 5：00．
   The Bus System
   Outside the center of London，Tube Stations are farther apart，so buses help fill the gaps．Also，the bus offers a cheaper alternative，even if it is a slower journey．
   Cash fares for London buses have been abolished-you cannot pay cash．A bus fare costs ￡1.50 if people only use buses，and the fare is capped at ￡4.40 per day for Oyster or contactless card users．
   Light Rail and Trains
   You can think of the Docklands Light Railway （DLR） and the Tramlink as extensions of the Underground，Travelcards purchased at Tube Stations in East London．The DLR connects with a number of the other train services （including connections at Tower Hill or Bank Stations） and can be used to reach Greenwich，Canary Wharf，and Stratford．
   River Services
   There are a number of different routes along the River Thames，The faster commuter services operate all day from Greenwich Pier to Embankment and from Putney and Chelsea harbour to Blackfriars during Peak Hours only．These routes will pass a number of places of interest including the Houses of Parliament and London Bridge．A return fare from Putney to Blackfriars will cost about 12 pounds．
   National Rail
   Once you leave Central London or if you are traveling South of the River Thames，the best public transport option will often be National Rail．There are numerous connections to the Rail System from the Tube．Travelcards can be used for travel on the National Rail （but not the Heathrow Express）．Oyster cards can be used up to Zone 6 except certain services including Heathrow Express，Heathrow Connect and HS1．

（1）When taking the London Underground，you

D

D

．
A．should buy tickets with cash
B．can go to any place in London quickly
C．can save more money with a single ticket
D．a(chǎn)re advised to take a bottle of water along on hot days
（2）If you use river services along the River Thames，you will pass

A

A

．
A．London Bridge
B．Stratford
C．Canary Wharf
D．Tower Hill
（3）To travel South of the River Thames，it is recommended that you use

D

D

．
A．the London Underground
B．the Bus System
C．the DLR and the Tramlink
D．National Rail