The new iPhone 3G should please everyone. Its look and feel are only slightly improved, but a faster network loads Web pages more quickly, true GPS functionality allows it to easily find places nearby, and the new $199 price (down from $400) makes it an affordable luxury.

Before deciding whether to buy, however, make sure you can actually take advantage of the iPhone 3G's high-speed data network. 3G stands for third-generation, which in non-geek speak translates to Web pages and mail messages that, ideally, load about three times faster than on the original iPhone. Even better, 3G coverage enables you to make a phone call and surf the Web at the same time. That's great, if you live or work in a place where the 3G network of AT&T（美国电话电报公司） (the sole wireless carrier of the iPhone) is active. That's not so great in cities like New York where AT&T's cellular coverage is awful. As one of my colleagues in New York City, who bought the original iPhone, commented, "It's just a toy. You can't make phone calls on it, so I carry my Verizon phone with me all the time."

The real fun begins when you tap on the icon called "App Store" and start browsing the hundreds of add-on applications that have been developed just for the iPhone. You'll find tons of games (I like JirboBreak, a free game inspired by the Atari classic Breakout) and mobile versions of popular websites like Pandora, Facebook, MySpace and the New York Times. Most apps will cost you, but the vast majority are $9.99 or less. The apps work on the old iPhones too, but you'll enjoy them a lot more on the iPhone 3G because many of the programs, including Yelp (local business reviews), Whrrl (mobile social networking) and UrbanSpoon (restaurant reviews), use your exact location — provided by the iPhone 3G's GPS chip — to make recommendations. The apps also load much faster over the 3G network.

The new iPhone 3G has following features except that _______

A. It looks and feels better                                B. It has a faster network

C. It is easy to locate a place                           D. It is too expensive for people to buy

Why do one of my colleagues carry Verizon phone with him all the time? ______.

A. Because iPhone 3G is just a toy.                                                 

B. ecause he prefers Verizon phone better.

C. Because AT&T's cellular coverage is terrible there

D. Because Verizon phone enables him make a phone call and surf the Web at the same time

Which of the following statements is NOT true according to the passage. ____.

A. App Store will offer you great fun.                                              B. many apps have been developed for the iPhone.

C. Most apps are very expensive.

D. Pandora, Facebook, MySpace and the New York Times are popular websites.

From the passage we know that the attitude of the author toward iPhone 3G is _____.

A. doubtful                   B. appreciative              C. optimistic          D. pessimistic

A computer virus is a program or piece of code that is loaded onto your computer without your knowledge and runs against your wishes. All computer viruses are manmade. Here are some virus prevention tips.
Do not open any files attached to an e-mail from an unknown, suspicious or untrustworthy source.
Do not open any files attached to an e-mail unless you know what it is, even if it appears to come from a dear friend or someone you know. Some viruses can replicate（复制） themselves and spread through e-mail. Better be safe that sorry and confirm that they really sent it .
Do not open any files attached to an e-mail if the subject line is questionable or unexpected. If the need to do so is there always save the file to your hard drive before doing so.
Delete chain e-mails and junk e-mail. Do not forward（转寄） or reply to any of them. These types of e-mail are considered spam（垃圾邮件）, which contains lots of annoying advertisements and useless information.
Do not download any files from strangers.
Be careful when downloading files from the Internet. Ensure that the source is a legitimate（合法的）and reputable one. Verify（证实）that an anti-virus program checks the files on the download site. If you are uncertain, don’t download the file at all or download the file to a floppy（软盘）and test it with your own anti-virus software.
Update your anti-virus software regularly. Over 500 viruses are discovered each month, so you’ll want to be protected. These updates should be at least the products virus signature files. You may also need to update the product’s scanning engine as well.
Back up（备份） your files on a regular basis. If a virus destroys your files, at least you can replace them with your backup copy. You should store your backup copy in a separate location from your work files, one that is preferably not on your computer.

1. 1.

   This passage mainly tells us              .

   1. A.
      What a computer virus is
   2. B.
      how to use e-mail safely
   3. C.
      how to use computers safely
   4. D.
      how to prevent computer viruses
2. 2.

   Which of the following statements about computer virus is TRUE?

   1. A.
      A computer virus is a kind of worm
   2. B.
      Not all computer viruses are manmade
   3. C.
      Computer viruses run according to our wishes
   4. D.
      A computer virus is a program or piece of code.
3. 3.

   When we use e-mail, we should                .

   1. A.
      open all the files we receive
   2. B.
      open any file even if we don’t know what it is
   3. C.
      not open any files if the subject line is questionable
   4. D.
      forward or reply to junk e-mail.
4. 4.

   Which of the following statements is NOT true?

   1. A.
      We’d better not down load any files from strangers.
   2. B.
      We’d better download files from a legitimate and reputable source.
   3. C.
      We should update our anti-virus software regularly.
   4. D.
      We should store our backup copy in the same location as our work files.