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.

根据句意和所给首字母补全单词。（共15题，每小题1分，满分15分）

1.Milk, water and oil are all l_____ while wood, iron and glass are solids.

2.You can easily find the site by entering the k_______ “Quark”.

3.Water is recognized as the s_____ of all life. Without it, there would be no life.

4.She was born in a         (富裕的) family.

5.The old man had no a________ to education when he was young.

6.Helen is____________ (担心的) about traveling on her own.

7.I think it’s only an o_________ camera and I needn’t pay such a high price for it.

8.Living in the business d_______ of a city provides a great convenience for shopping.

9.As students, we must c____________ our attention on our lessons.

10.People are concerned about the quality of the air they___________ (呼吸).

11.Children should be encouraged to be __________（独立的）thinkers. 

12.Helen is the most diligent shop____________ (助手) that I have ever seen.

13.She lost the d_______ necklace that she borrowed from one of her friends.

14.She has read many of the major works of _________ (文学).

15.The _________ (百分率) of overweight people around the world has been increasing these years.

 A new study warns that about thirty percent of the world’s people may not have enough water by the year 2025.

An American organization called Population Action International did the new study. It was more than three hundred and thirty-five million people lack enough water now. The people live in twenty-eight countries. Most of the countries are in Africa or in the Middle East.

Population Action International researcher Robert Engelman says by the year 2025, about three thousand million people lack water. At least 18 more countries are expected to have serious water problems. The demand for water keeps increasing. Yet the amount of water on the earth the same. Mr Engelman says the population in countries that lack water is growing in these countries will continue to increase.

The report says lack of water in the future may result several problems. It may increase health problems. Lack of water often means drinking water is not safe. Mr Engelman says there are problems all over the world because of diseases such as cholera that are carried in water.

Lack of water also may result in more international conflict. Countries may have to fight for water in the future. Some countries, such as Syria, Sudan, Cambodia, and so on, now get sixty percent of their fresh water from other countries. And the report says lack of water would affect the ability to improve their economies. This is because industries often need a large amount of water.

The Population Action International study gives several ways to solve the water problem. One way is to find ways to use water for more than one purpose. Another way is to teach people to be careful not to waste water. A third is to use less water for agriculture. The report also says long-term solutions to the water problem must include controls on population growth.

1.According to the report, how many countries will lack water by the year 2025?

2.____ million will lack water by the year 2025?

3.Which of the following is NOT true according to the passage?

4.The passage mainly tells us that_____.

How many times do you have to fail at something in order to succeed? Did you know that Thomas Edison failed 10,000 times while trying to invent the light bulb? He certainly had a “learn and do” attitude! He was able to turn each failed experiment into a successful way to invent the light bulb. So what can we learn from this? You can adopt the “fail forward” strategy too.

In reality, none of us are failures. It’s true that we will experience times of defeat, problems, and disasters, but remember, each one of us is meant to succeed in life. However, we must choose our fate. Henry David Thoreau said, “Men are born to succeed, not to fail.”

We can never be forced into having a happy and successful life. Whether or not you experience success or failure is completely controlled by what you think and do. You are the only one who can choose the thoughts that will keep you from achieving the abundant life and joy that you are meant to have. No matter how difficult things may seem, say to yourself, “I choose to be a happy and successful person.”

Why do some people get what they want and others fail? I believe that getting what you desire in life takes planning, and it doesn’t just happen by luck. So how do we plan for success?

It has been proven that successful people do things more differently than unsuccessful people. They recognize the patterns of success and follow them; one of those patterns is planning. They plan what they think and do, which sets them apart. They know exactly what they desire, have an intelligent plan for getting it, and then work their plan. They know what success will cost them in terms of time, energy, and results, and they devote the right resources toward making their plans happen.

1.The writer refers to Thomas Edison to ________.

A．introduce his invention

B．put forward the topic of the text

C．praise the inventor

D．show the way to success

2.What Henry David Thoreau said implies that ________.

A．everyone is able to be a success

B．most people lack the confidence to succeed

C．everyone can do nothing but succeed in his life

D．no one can succeed without difficulty and suffering

3.The main idea of the last two paragraphs is that ________.

A．planning plays an important role in success

B．successful people differ from unsuccessful ones

C．successful people have many patterns of success

D．devoting the right resources can help reach one’s goal

4.Which of the following would match the text?

A．All roads lead to Rome.        B．Think twice before you act.

C．No pains, no gains.       D．Failure is the mother of success.

We must keep our room clean, for dirt and disease go______, you know.

A.hand in hand     B.step by step    C.from time ti time   D.one zfter another