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Recently, several thousand computers in the United States were attacked by a virus. The co

mputers were slowed or shut down. But no information was lost. A computer virus is similar to a biological virus--an organism (生物体) that can harm the human body. A computer virus is a series of electronic commands that can harm a computer or the information in the computer. It infects the device (设备) secretly. It tells the computer to do something the computer's owner does not want it to do. For example, a virus could enter a bank's computer system. It might tell the system to destroy all information about money belonging to everyone with the first name United States several months ago. The virus was created by a university student studying computer science. The computers affected by the virus were in major universities, government agencies (政府机关) and private (私人) companies. They were part of a United commands in a computer at his school. The computer sent the commands to other computers through the linked telephone lines.

The virus told each computer to make many copies of itself. Within a few minutes, all the computers' power was being used to make copies of the virus. The computer could do no other work. It finally slowed down greatly, or simply stopped working. Computer experts spent many days trying to destroy the virus in the computer system.

The experts agree the virus could have been much worse. They say it could have sent orders to destroy huge amounts of electronic information.

Many experts believe, the recent computer virus showed the need for better computer security (安全). But that is a problem. The affected system provides a free exchange (交换) of ideas and information among universities, private companies and government offices. Increasing security too much would destroy this exchange. It would slow progress on many important research projects.

Which of the following statements is true?

A.Many computers were attacked by a virus in the U. S.

B.Many computers attacked by a virus in the U.S. lost their information.

C.A computer virus can harm human body.

D.A computer virus can help the computer owner do many things.

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第1题
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第2题
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第3题
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第5题
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第6题
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第7题
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第8题
Many Native Americans closely resemble Asians. This has led most scientists to (1) believe somet

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第9题
Recently, one of my best friends Jennie, with whom I have shared just about everything sin
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What word best sums up Jennie's boy friend?

A.A drug user.

B.A loser.

C.A trouble maker.

D.A criminal.

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第10题
I was a freshman in college when I met the Whites. They were completely different from my
own family. Jane White and I became friends at school, and her family welcomed me like along-lost cousin.

In my family it was always important to place blame when anything bad happened. But the Whites didn't worry about who had done what. Mr. and Mrs. White had six children: three sons and three daughters.

In July, the White sisters and I decided to take a car trip to New York. The two oldest, Sarah and Jane, were college students, and the youngest, Amy had recently got a driver' s license, and was excited about practicing her driving on the trip.

The big sisters let Amy take over. She came to an intersection with a stop sign, but Amy continued without stopping. The driver of a large truck, crashed into our car.

Jane was killed instantly.

When Mr. and Mrs. White arrived at the hospital, they hugged us all.

To both of their daughters, and especially to Amy, over and over they simply said, "We' re so glad that you're alive."

I was astonished. No blame.

Later, I asked the Whites why they never talked about the fact that Amy was driving and had run a stop sign.

Mrs. White said, "Jane's gone, and nothing we say or do will bring her back. But Amy has her whole life ahead of her. How can she lead a full and happy life if she feels we blame her for her sister' s death?"

They were right. Amy graduated from college and got married several years ago, She works as a teacher of learning-disabled students. She' s also a mother of two little girls of her own, the oldest named Jane.

The writer of the article is ______ .

A.Mrs. White's niece

B.the Whites' cousin

C.Sarah' s friend at college

D.Jane' s friend at school

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