2．Whether you're making a one-off trip to London or youre a regular visitor，using an Oyster travel smartcard is the easiest way to travel around the city's public transport network．
Advantages of a Visitor Oyster Card
A Visitor Oyster Card is one of the best ways to pay for single journeys on the bus，tube，DLR，tram，London Over-ground and most National Rail services in London：
●Save time--your card is ready to use as soon as you arrive in London．
●It's more than 50% cheaper than buying a paper travel card or single tickets with cash．
●There is a daily price cap--once you have reached this limit，you won't pay any more．
●Enjoy special offers and promotions at leading London restaurants，shops and entertainment venues--plus discounts on the Emirates Air Line cable car and Thames Clippers riverbuses．
Buy a Visitor Oyster Card
Buy a Visitor Oyster card before you visit London and get it delivered to your home address．A card costs￡3 （non-refundable） plus postage．Order online and arrive with your Oyster in hand!You can also buy a Visitor Oyster card from Gatwick Express ticket offices at Gatwick Airport Station and on board Eurostar trains travelling to London．
Top Up（充值）Your Visitor Oyster Card
You can choose how much credit to add to your card．If you are visiting London for two days，you can start with￡20credit．If you run out of credit，add credit at the following locations：
●Touch screen ticket machines in tube，DLR，London Over-ground and some National Rail stations．
●Around 4，000Oyster Ticket Stops found in newsagents and small shops across London．
●TFL Visitor and Travl Information Centers．
●Tube nd London Over-ground station ticket offices．
●Emirates Air Line terminals．
21．What benefit will you get from a Visitor Oyster Card when travelling in London？C
A．It increases your working efficiency．
B．It allows you to have meals free of charge．
C．It saves you money on transportation．
D．It provides a 50% discount at a London shop．
22．How many ways are mentioned to buy a Visitor Oyster Card in the passage？B
A.2．
B.3．
C.4．
D.5．
23．Where can you top up your Visitor Oyster card？A
A．At Gatwick Express ticket offices．
B．At a tube station ticket office．
C．On the Internet．
D．On Eurostar trains．
分析 文章介绍了游览伦敦使用Visitor Oyster Card的好处，如何购买及如何充值．
解答 21．C 细节理解题．根据文章第二段中的A Visitor Oyster card is one of the cheapest ways to pay for single journeys on the bus，Tube，DLR，tram，London Over-ground and most National Rail services in London及下面的具体介绍，可知A Visitor Oyster card可以帮助游客节省些交通费．故选C．
22．B 细节理解题．根据文中Order online and arrive with your Oyster in hand!You can also buy a Visitor Oyster card from Gatwick Express ticket offices at Gatwick Airport Station and on board Eurostar trains travelling to London．可知，文章提到了三种购买方式．故选B．
23．A 细节理解题．根据文章最后If you run out of credit，add credit at the following locations如果您用完信用卡，请在下列位置添加信用：下面所提到的Tube and London Over-ground station ticket offices地铁和伦敦地面站售票处．可知答案．故选A．
点评 本文是一个广告布告类阅读理解，题目涉及多道细节理解题，做题时结合原文和题目有针对性的找出相关语句进行仔细分析，结合选项选出正确答案．推理判断题也是要在抓住关键句子的基础上合理的分析才能得出正确答案，切忌胡乱猜测，一定要做到有理有据．
