50 Which of the following statements about the Oyster card is correct?
(A) The card cannot be returned.
(B) The name “Oyster” is associated with efficiency.
(C) The pink smartcard is the same size as a credit card.
(D) The name of the card was inspired by a Shakespeare’s quote.

London is one of the top travel destinations目的地 in the world, but for a first time visitor, navigating導航 this large city can be overwhelming壓垮.

Using an Oyster card遊客牡蠣卡 is an easy way to save time and money if you are planning to use public transportation in London.

An Oyster card is a blue credit-card-sized contactless感應支付 smartcard that can be used on every form 形式 of public transportation within內London, including public bus, underground, railway, and some river boat services.

The Oyster card was first issued發行 on June 30, 2003.

The name was decided after a lengthy漫長 discussion討論.

Two other proposed提議 names were “Pulse脈搏” and “Gem寶石.” “Oyster” was chosen because it sounded like a fresh name that was not directly直接 linked連結 to transportation; also, the hard shell of an oyster and the concealed隱含 pearl珍珠 symbolize象徵 security保護 and value.

But perhaps the best reason is William Shakespeare’s quote “ The world is your oyster,” which means one has the ability and freedom to do anything or go anywhere.

So far more than 60 million cards have been issued and over 85%of rail鐵軌 and bus travel in London is paid by using an Oyster card.

The card never expires期滿.

It can be used after any length長度 of time.

Besides, deposits儲存（尤指金錢） can be refunded退還 on return歸還 of the card.

The best reason to get an Oyster card is cost savings節省 and convenience.

It is cheaper to travel in London with this card than it is to purchase individual個人 paper tickets for each trip.

The card allows 40 people to pass through通过 a ticket gate per minute, 15 more than with paper tickets, and also makes boarding a bus three times faster.

For London Underground and the railway system, passengers have to touch the card on an electronic reader when entering and leaving the transport system.

The reader will show either a green or a red light.

The former較早 indicates表明 that you have sufficient足夠 credit餘額 for your journey while the latter indicates you do not have enough credit and you have to purchase more credit before you can continue your journey.

For the public bus service, which has fixed price, passengers only need to touch the reader at the start of the journey when boarding.

If you touch the reader again when you get off the bus, you will be charged an additional額外 fare费用.

(A) The card cannot be returned. 
(B) The name “Oyster” is associated關聯 with efficiency. 

(C) The pink smartcard is the same size as a credit card. 
(D) The name of the card was inspired by a Shakespeare’s quote.