阅读短文，回答问题。 If you are a member of a social networking (社交的) website such as QQ, Kaixin, MySpace or Facebook, you can add a new friend by sending someone a friend request (请求). If you later fall out with that person, what do you do? You can hit the 'unfriend' button (操作框) and remove (移走) him or her from your friend list. That means you won't talk, exchange information, or see each other's updates (更新) on the website any more. That is a quick way to solve problems, isn't it? In fact, 'unfriend' is often used on social networking websites. It has become so popular that Oxford University Press recently chose it as the 2009 word of the year. Experts at Oxford University Press look at how the words of the English language change from year to year. They choose words that are popular and have important cultural meanings. Christine Lindberg, editor for Oxford's dictionary program, said the word 'unfriend' is popular now and may stay popular for a long time. People understand its meaning in the online social networking context (上下文), and also accept it as a modern verb. So it makes an interesting choice for the Word of the Year. How to use the word? You can say 'I decided to unfriend my roommate on Facebook after we had a fight' or 'I unfriended Alice on MySpace when she said something bad to me.' 1. How many social networking websites are mentioned? [     ] A. Two. B. Three. C. Four. D. Five. 2. You can add a new friend by ______. [     ] A. calling the person on the phone B. meeting the person face to face C. inviting the person to dinner D. sending the person a message 3. If you hit the 'unfriend' button, you can ______. [     ] A. remove a person from your friend list B. share information with a person C. send a person a friend request D. send messages to a person 4. The phrase 'fall out with' probably means ______. [     ] A. break up with B. get on well with C. make friends with D. fall in love with 5. 'Unfriend' was chosen as the 2009 word of the year because of the following EXCEPT_______. [     ] A. it is widely used on the web B. it has important cultural meanings C. it is a good way to solve problems between friends D. it is understood and accepted by many people