Recent research from the Pew Internet Project suggests that 90% of Americans aged from 12 to 17 use the Internet, and 51% of those teens use social networks. However, there are many possible problems with social networking sites and the teenagers who use them.

Apart from the social advantages, social networking sites can be used to record school research, develop artistic talents and experiment with other forms of subject creation. They provide a way to communicate with others who share the same interests and to get helpful advice on ongoing projects.
Along with these advantages come some dangers. For example, most social networking sites are open to all, especially MySpace, which is the most popular social network among teens in America. It means that they could be put in unpleasant and frightening situations.
A greater danger is that teens may become objects of the people with secret purposes. The secrecy of some social networking sites makes it easy for dangerous people to find young teens and invite them into dangerous conversations. It’s easy for them to pretend as teens and draw children into dangerous real-world communication as well. Then further hurt might be on its way.
Another danger is identity stealing, which can happen when teens share too much information about their names, dates of birth and locations.
Therefore, it’s very important to make sure teens are safe when they use social networks.
Many of the same rules that work for online chat work for these sites:
※Don’t use your real name.
※ Don’t give out personal information to people you don’t know. A last name and a town
are enough for a bad guy to find where you are.
※ Don’t believe that people are who they say to be.
※ Immediately end any communication that makes you uncomfortable and report it to a
parent.
Only if you are sure of your safety, can you enjoy the fun brought by social networking. Besides, trying to deal with all problems on your own can lead to terrible results. Remember, asking your parents or school officials for help doesn’t mean you are unable to do anything but wiser than many others.                                             
【小题1】How many dangers of using social networks are mentioned in the passage?

I don’t think teenagers should       go to bars.

A. allow to    B. be allowed to     C. not allow to      D. be allowed

Time waits for no man. But teenagers won’t realize the value of time until it’s gone. Don’t waste your time,        you will regret it.

A. and               B. or                  C. but

My summer hols wr CWOT. B4, we usd 2 go 2 NY 2C my bro, his GF ＆ thr 3 : -@ kids FTF. ILNY; its gr8.
Can you understand this sentence? If you can’t, don't feel too bad. The middle school teacher in England who received this as homework couldn’t either. This is Netspeak: the language of computerized（电脑化的）communication found on Internet or mobile phones. To newcomers, it can look like a completely foreign language. So, what is the "translation" of the sentence above? My summer holidays were a complete waste of time. Before, we used to go to New York to see my brother, his girlfriend, and their three screaming kids face to face. I love New York; it’s great.
Schoolteachers and parents say this new form of writing is harming the English language. Increasing spelling and grammatical mistakes can be seen in students' writing. They fear the language could become corrupted (面目全非的).
Everyone should just relax, say linguists (语言学家). They believe Netspeak is in fact more of a good thing. David Crystal, from the University of Wales, argues that Netspeak and Internet create a new language use and the almost lost art of diary writing has been picked up again. Geoffrey Nunberg, from Stanford University, agrees. "People get better at writing by writing," he says, “Kids who are now doing text messaging and e-mail will write at least as well as, and possibly better than, their parents."
Linguist James Milroy says, for centuries, it is believed without exception（例外）that young people are harming the language. And you can bet your bottom dollar that when today's teenagers become tomorrow's parents, they too will think this way. Milroy argues that languages do not and cannot become “corrupted”, and that they simply change to meet the new needs.
However, Netspeakers do agree that it is important to teach young people how to speak and write Standard English. Cynthia Mcvey says, "I can understand Netspeak worries teachers and it's important that they get across to（沟通）their pupils that text messaging is for fun, but that learning to write proper English is a must for their future.”
Perhaps we should give teenagers a little more trust anyway. Erin, age 12, says, "I wouldn't use text language in my homework. Texting is just for fun."
【小题1】What is the main purpose of the first paragraph?

完形填空 (30分)
阅读下面短文，从短文后所给的四个选项中，选出可以填入空白处的最佳选项。
A
In today’s world, pollution has become a serious problem.  51.  we know, air pollution is harmful to our health. However, not all people know that noise    52  also a kind of pollution and is harmful to human health.
People who work and live in noisy conditions may become   53  . For example,  many of the workers who   54. newspapers and books become deaf. Quite a few people living near   55 also have hearing lose. Recently it was reported that many teenagers in America  56 hear better than the old do, because these young people always listen to  57 pop music.  Making a loud noise in public is also a kind of pollution, it not only  58  others but also does great harm to hearing. Cars and machines also produce 59 noise. It makes people feel uncomfortable and unpleasant.  60  , it can cause them to be sick or deaf.Nowadays many countries are trying to solve all sorts of environmental problems, including noise pollution.