The virus （) thousands of computers within days.

A computer virus ______.

A．is the same as a biological virus

B．is also an organism

C．is a series of electronic commands

D．is one of biological viruses

fluenzalike cases. Influenza is sometimes called "flu" or a "bad cold". He took samples from the throats of patients and in his hospital was able to find the virus of this influenza.

There are three main types of influenza virus. The most important of these are types A and B, each of them having several sub-groups. With the instruments at the hospital the doctor recognized that the outbreak was due to a virus group A, but he didn't know the sub-group. He reported the outbreak to the World Health Organization in Geneva. WHO published the important news alongside reports of a similar outbreak in Hong Kong, where about 15%～20% of the population had become ill.

As soon as the London doctors received the package of throat samples, they began the standard tests. They found that by reproducing itself at very high speed, the virus had multiplied more than a million times within two days. Continuing their careful tests, the doctors checked the effect of drugs used against all the known sub-groups of type A virus. None of them gave any protection. This then, was something new; a new influenza virus against which the people of the world had no ready help whatsoever.

Having isolated the virus they were working with, the doctors now conducted tests on some specially selected animals, which contracted influenza in the same way as human beings did. In a short time the usual sign of the disease disappeared. Theses experiments revealed that the new virus spread easily, but that it was not a killer. Scientists, like the general public, called it simply "Asian" flu.

The influenza discovered by a doctor in Singapore is caused by ______.

A．a new type of virus

B．type A virus

C．a sub-group of type B virus

D．a virus only existing in Asia

H-live-n-one virus in the passage means ______.

A. farm birds

B. infected farm animals

C. people died in Hong Kong

D. a different kind of bird flu virus

Which of the following is true according to the passage？ ______.

A．This influenza can cause death if not treated immediately

B．The number of the influenza virus can grow very rapidly

C．The people who got the disease recovered soon

D．The London doctors didn't take the virus seriously at first

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.

The virus can affect the computers in the computer system by ______.

A．turning off the power

B．making them copy itself

C．sending them copies of itself

D．sending them some destructive ordens directly

What is known about the influenza virus？

A. It was first found in a group of very old birds.

B. All the different strains can be found in wild birds.

C. It existed over 100 million years ago.

D. It can survive in many different places.

According to the passage，a great variety of influenza strains can appear when______.

A. H and N spikes are produced

B. animal and bird viruses are combined

C. dissimilar types virus recombine

D. two viruses of the same type are contracted

IV. Reading Comprehension (60 points)

Directions: There are five reading passages in this part. Each passage is followed by four questions. For each question there are four suggested answers marked A, B, C and D. Choose one best answer and blacken the corresponding letter on the Answer Sheet.

Passage One

Wild and farm birds often get a flu virus. Yet they usually are able to carry the virus without getting sick.

In 1997 six people in Hong Kong died of a different kind of bird flu virus. It is called the h-five-n-one virus. The Hong Kong government quickly ordered the killing of all farm birds there. That stopped the spread of h-five-n-one to people in Hong Kong.

Yet the virus bad already spread to other parts of Asia. It was found in 16 countries between 2003 and 2006.

The h-five-n-one virus first appeared in Africa. This raised many concerns about the spread of the disease. Scientists do not know exactly how bird flu came to Africa. At first, they thought wild birds were to blame. Now, officials with the U. N. Food and Agriculture Organization believe the main cause is trade in farm birds.

The bird flu virus is found in the waste and liquids of infected birds. The virus spreads when healthy birds or people touch sick birds or nay infected (被感染了的) part of sick birds. Right now, the virus is not spreading among person to person. But the virus could change and start spreading among people. Health officials believe that it is even more possible now that bird flu has spread in Africa, and that is why international organizations are working so hard to stop its spread.

The best way to stop the spread of bird flu is to kill all the chickens in an area where bird flu has been discovered. More than 145 000 chickens have been killed in Nigeria since bird fin was first found one year ago.

36. The passage focuses on ______.

A. wild and farm birds

B. a fin virus

C. bird flu

D. infected birds

W.H.O. reported the influenza because ______.

A. the doctor belonged to that organization

B. many people in Hong Kong also suffered from it

C. the doctor found its virus and sent the samples to them

D. it spread widely in Singapore for the first time

Who reported the influenza because ______.

A．the doctor belonged to that organization

B．many people in Hong Kong also suffered from it

C．the doctor found its virus and sent the samples to WHO

D．it spread widely in Singapore for the first time