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.

This passage mainly tells us              .

A. What a computer virus is

B. how to use e-mail safely

C. how to use computers safely

D. how to prevent computer viruses

Which of the following statements about computer virus is TRUE?

A. A computer virus is a kind of worm

B. Not all computer viruses are manmade

C. Computer viruses run according to our wishes

D. A computer virus is a program or piece of code.

When we use e-mail, we should                .

A. open all the files we receive

B. open any file even if we don’t know what it is

C. not open any files if the subject line is questionable

D. forward or reply to junk e-mail.

Which of the following statements is NOT true?

A. We’d better not down load any files from strangers.

B. We’d better download files from a legitimate and reputable source.

C. We should update our anti-virus software regularly.

D. We should store our backup copy in the same location as our work files.

A famous American John Muir said in 1898: “The Grand Canyon… as unearthly (神秘的) in the color and grandeur (壮观) of its architecture as if you had found it after death on some other star.” Like Muir, those of us who stand along the rim are prompted to wonder about the unearthliness and the forces that created and are still changing this place.

After more than 100 years of studies, many things are still mysterious. Today visitors come by the thousands -- the great and simple of the earth -- all in a spirit of wonder. Travelers come from every state of the Union, from every country in Europe and Asia.

From the depths of the canyon comes welling silence. Seldom can you hear the roar of the river, for all sounds are swallowed in this gulf of space. “It makes one want to murmur.” A woman once whispered to her companion. This silence is not the silence of death; rather, it is a presence. It is like a great piece of music. But music made of man works up to a climax (高潮) and stops.

Now, visitors to the South Rim alone may number 18,000 in a single day. Some of that number will travel by mule train down Bright Angel Trail to the canyon's floor, cross the raging river by a suspension bridge (吊桥) and walk to the North Rim. Though the two rims face each other across only 12 miles, it is a journey of 214 miles by car from one to the other. Nor can you visit the North Rim except in summer; some 1,200 feet higher than the South Rim, it is snow covered much of the year except in July and August.

   But there is no day that you may not visit the South Rim and find the sun warm on your face and the air perfumed with the incense (香气) of smoke from an Indian hearth (香炉). No wonder an American writer and journalist said, “I came here an atheist (无神论者), and departed a devout （虔诚的）believer.”

What is it that attracts so many travelers to the Canyon?

A. The unearthliness and the grandeur of its architecture.

B. The presence of American super stars.

C. The saying made by American writers and journalists.

D. The roaring of the river in the Canyon.www..ocm

What does the underlined word “simple” refer to?

A. peaceful stream  B. land surface       C. common people        D. tamed animals

If you want to visit the North Rim from the South Rim, which of the following won’t be the way of traveling for you?

A. By train.                B. By animal.      C. By car.                         D. On foot.

The last sentence “I came here an atheist, and departed a devout believer.” implies that ______.

A. natural wonders such as the Canyon have some effect on human activities

B. all visitors to the Grand Canyon are God believers

C. atheist can’t see the magnificence of the Grand Canyon

D. the Grand Canyon is an unearthly sight that only God could create

Here are six steps to better studying.
Pay attention in class
Do you have trouble paying attention in class? Are you sitting next to a loud person? Tell your teacher or parents about any problem that is preventing you from paying attention.
Take good notes
Write down facts that your teacher mentions or writes on the board. Try to use good handwriting so you can read your notes later. It’s a good idea to keep your notes organized by subject.
Plan ahead for tests and projects
Waiting until Thursday night to study for Friday’s test will make it hard to do your best. One of the best ways to make sure that doesn’t happen is to plan ahead. Write down your test dates. You can then plan how much to do after school each day, and how much time to spend on each topic.
Break it up
When there’s a lot to study, it can help to break things into several parts. Let’s say you have a spelling test on 20 words. Instead of thinking about all of the words at once, try breaking them down into five-word groups and work on one or two different groups each night.
Ask for help
You can’t study effectively if you don’t understand the material. Be sure to ask your teacher for help. If you’re at home when the confusion occurs, your morn or dad might be able to help.
Sleep tight
So the test is tomorrow and you’ve followed your study plan—but suddenly you can’t remember anything! Don’t panic. Your brain needs time to digest all the information you’ve given it. Try to get a good night’s sleep and you’ll be surprised by what comes back to you in the morning.
【小题1】We know from the passage that a loud person is       .

Here are six steps to better studying.
Pay attention in class
Do you have trouble paying attention in class? Are you sitting next to a loud person? Tell your teacher or parents about any problem that is preventing you from paying attention.
Take good notes
Write down facts that your teacher mentions or writes on the board. Try to use good handwriting so you can read your notes later. It’s a good idea to keep your notes organized by subject.
Plan ahead for tests and projects
Waiting until Thursday night to study for Friday’s test will make it hard to do your best. One of the best ways to make sure that doesn’t happen is to plan ahead. Write down your test dates. You can then plan how much to do after school each day, and how much time to spend on each topic.
Break it up
When there’s a lot to study, it can help to break things into several parts. Let’s say you have a spelling test on 20 words. Instead of thinking about all of the words at once, try breaking them down into five-word groups and work on one or two different groups each night.
Ask for help
You can’t study effectively if you don’t understand the material. Be sure to ask your teacher for help. If you’re at home when the confusion occurs, your morn or dad might be able to help.
Sleep tight
So the test is tomorrow and you’ve followed your study plan—but suddenly you can’t remember anything! Don’t panic. Your brain needs time to digest all the information you’ve given it. Try to get a good night’s sleep and you’ll be surprised by what comes back to you in the morning.
【小题1】We know from the passage that a loud person is       .

Here are six steps to better studying.
Pay attention in class
Do you have trouble paying attention in class? Are you sitting next to a loud person? Tell your teacher or parents about any problem that is preventing you from paying attention.
Take good notes
Write down facts that your teacher mentions or writes on the board. Try to use good handwriting so you can read your notes later. It’s a good idea to keep your notes organized by subject.
Plan ahead for tests and projects
Waiting until Thursday night to study for Friday’s test will make it hard to do your best. One of the best ways to make sure that doesn’t happen is to plan ahead. Write down your test dates. You can then plan how much to do after school each day, and how much time to spend on each topic.
Break it up
Ask for help
You can’t study effectively if you don’t understand the material. Be sure to ask your teacher for help. If you’re at home when the confusion occurs, your morn or dad might be able to help.
Sleep tight
So the test is tomorrow and you’ve followed your study plan—but suddenly you can’t remember anything! Don’t panic. Your brain needs time to digest all the information you’ve given it. Try to get a good night’s sleep and you’ll be surprised by what comes back to you in the morning.
【小题1】We know from the passage that a loud person is       .