Other viruses modify the operating system in order to camouflage their existence, the wo - 试题答案网问答

第1题

What make it is difficult to agree on how to count viruses().

A.just a trivial change may create a new virus

B.some viruses can use polymorphic technique

C.some viruses can create different versions when they infect other programs

D.new virus arise from an existing virus

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第2题

Viruses are human-made software programs【C1】______specifically to wreak havoc on personal

computers and networks. The【C2】______of contracting one of these computer viruses over the Internet has increased dramatically. Typically, you get a virus by opening e-mail【C3】______.

Some viruses are relatively【C4】______to individuals. They just【C5】______themselves to【C6】______messages or e-mail themselves to all the people listed in your address book. The sudden flood of email【C7】______mail servers, causing the system to【C8】______.

Other viruses are more【C9】______,and may lie asleep until a certain date. Then they【C10】______to life to do their dirty【C11】______. Sometimes a strange message appears on your screen, or data and programs may be【C12】______. In the worst case, all the contents of your hard drive may be【C13】______out. These【C14】______programs start on one computer, then replicate quickly,【C15】______other computers around the world.

In 1988, a student at Cornell University sent out a virus by【C16】______, nearly【C17】______the Internet to its knees. More recently, the "I Love You" virus caused over $1 billion in lost【C18】______as it【C19】______e-mail systems worldwide. Last year【C20】______, 10, 000 new viruses, worms and Trojan horses were unleashed.

【C1】

A．existed

B．discovered

C．created

D．manufactured

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第3题

One interesting thing about the virus in the story was that it ______.A．was especially wea

One interesting thing about the virus in the story was that it ______.

A．was especially weak

B．was similar to other viruses

C．could reproduce at great speed

D．had samples frozen and packed in dry ice

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第4题

Viruses are human-made software programs【B1】specifically to wreak havoc on personal comput

ers and networks. The【B2】of contracting one of these computer viruses over the Internet has increased dramatically. Typically, you get a virus by opening e-mail【B3】.

Some viruses are relatively【B4】to individuals. They just【B5】themselves to【B6】messages or e-mail themselves to all the people listed in your address book. The sudden flood of e-mail【B7】mail servers, causing the system to【B8】.

Other viruses are more【B9】and may lie asleep until a certain date. Then they【B10】to life to do their dirty【B11】. Sometimes a strange message appears on your screen, or data and programs may be【B12】. In the worst case, all the contents of your hard drive may be【B13】out. These【B14】programs start on one computer, then replicate quickly,【B15】other computers around the world.

In 1988, a student at Cornell University sent out a virus by【B16】, nearly【B17】the Internet to its knees. More recently, the "I Love You" virus caused over $1 billion in lost【B18】as it【B19】e-mail systems worldwide. Last year【B20】, 10,000 new viruses, worms and Trojan horses were unleashed.

【B1】

A．existed

B．discovered

C．created

D．manufactured

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第5题

听力原文：（With) Other viruses, such as smallpox and measles, and polioneuromere, the major

听力原文：(With) Other viruses, such as smallpox and measles, and polioneuromere, the majority of people mount an immune response even if they never been vaccinated that clears the natural infection. With H1V, there are virtually no incidents of a person who has completely cleared the virus from their body, which means that although some people can control the virus better than others, the body is having trouble making a protective immune response.

What is the point the speaker is trying to make about HIV virus？

A．HIV vaccines trigger an immune response, but that response has proven inadequate.

B．The body's natural immune response to HIV infection could eradicate the virus.

C．The majority of people could mount an immune response even without being vaccinated that clears the natural infection from every virus.

D．Some people can control HIV virus better than others and make a protective immune response.

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第6题

There are some steps you can take yourself to avoid catching a cold. Contrary to popular b

elief, colds are not caused by exposure to severe weather. Colds are caused by viruses(病毒)harbored in the body, and you' re better off out on the ski slopes or even waiting for the bus on a snowy day than you are in a toasty warm room, surrounded by friends, co-workers, or fellow students, who just may be passing the virus around. If you feel a chill when you're coming down with a cold, you're already sick. A chill is an early symptom: It's the cold that caused the chill, not the other way around.

While the virus can spread through droplets propelled into the air when a cold-sufferer coughs or sneezes, surprisingly, this is not the most common route of transmission. Numerous studies have now shown that the overwhelming majority of colds are "caught" by hand contact. A cold-sufferer rubs her nose, thereby transferring the virus to her hand. Then a friend comes to visit.

"Don't kiss me," she cautions, so the friend steps back and presses her hand. The friend then wipes her own nose or eye--and several days later is stricken with a cold. Or parents pick up their child's discarded(丢弃了的)tissues and carefully throw them away, but fail to wash their hands afterward.

Cold viruses also can be transferred to objects--telephones, towels, plates--and remain infections for up to three hours. Frequent hand-washing--on the part of the cold-sufferer as well as other members of the household--will minimize the spread of viruses in this way.

Colds are caused by exposure to severe weather.

A．Right

B．Wrong

C．Not mentioned

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第7题

听力原文：Computer users are advised to adopt good computing practices to keep their comput

听力原文： Computer users are advised to adopt good computing practices to keep their computer virus-free. "Protecting our computers against virus attacks is very important nowadays when computers are commonly and widely used in our home and offices." said a spokesman for the Information Technology Services Department (ITSD).

"Typical payload of computer virus can range from cresting annoyances such as affecting the mouse, keyboard or other computer functions, to more destuctive actions like modifying or deleting files, or exposing secret information from the hard disk of the victim's computer." Some computer virus may format the hard disk to corrupt all data stored inside the computer.

"Besides, there are also computer viruses that will create mass mailing or scanning traffic not only to turn infected computers into a platform. for launching further attacks to other computers, but also to consume mailbox storage and network bandwidth."

"As a result, the network and computer systems will be overloaded and the normal operation of the network and computer systems will be seriously affected." said the spokesman.

He noted that the impact was particularly singnificant due to the current highly interconnected computer notwork environment." To avoid such inconveniences and losses, we should take effective computing practices to prevent our computers from virus infections .In fact, such practices are simple and easy." said the spokesman.

(33)

A．Computers are commonly and widely used in home and offices nowadays.

B．Computers are easily to be attacked.

C．Adopting good computing practices is a good advice to protect the computer.

D．The viruses are too fearful, computer is not safe any more.

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第8题

根据材料回答{TSE}题： Tiny Invaders The human body is truly amazing．It allows US to sense

the world around US，to do work and have fun，and to move from place to place．In fact，the human body does its work so well that most people don’t think about it very much一until they get sick． The germs(致病菌)that make people sick are everywhere．You can’t see them,but they’re there．They’re sitting on your desk．They’re hiding on your computer’S keyboard．They’re even in the air that you are breathin9．There are two types of germs：viruses and bacteria(细菌)．Viruses are germs that can only live inside animals or plants．Viruses cause illnesses such as flu and measles(麻疹)．Bacteria are tiny creatures．Some bacteria are good．They can help your stomach break down food． Other bacteria aren’t so good．They can make you sick．Bacteria can cause sore throats(喉痛)and ear infections． How can you stop these tiny invaders from making you sick？Your skin is the first defense against germs．You can prevent some illnesses simply by washin9，with soap and water．But germs can still enter the body through small cuts in the skin or through the mouth，eyes，and nose． Once germs are inside your body，your immune(免疫的)system tries to protect you．It looks for and destroys germs．How does it do that？Special cells patrol your body．Some of these cells actually eat germs!Other cells make antibodies．An antibody sticks to a germ．There is a different antibody for each kind of germ．Some antibodies keep germs from making you sick．Others help your body find and kill germs．After a germ is destroyed，the antibodies stay in your body．They protect you if the same kind of germ comes back．That way you will not get the same illness twice． You can keep your body healthy by eating a nutritious(有营养的)diet to make your immune system strong．You can also help your immune system fight germs by getting vaccinated(接种)．Vaccines are medicines．They contain germs that have been killed or weakened．The dead germs can’t make you sick．Instead，they cause your body to make antibodies．If the same germ ever shows up again, then your antibodies attack it． {TS}Viruses can only live inside people or animals．

A. Right

B. Wrong

C. Not mentioned

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第9题

听力原文：Many people catch a cold in the spring time or fall. It makes us wonder: if scien

听力原文： Many people catch a cold in the spring time or fall. It makes us wonder: if scientists can send a man to the moon, [33] why can't they find a cure for the common cold？ The answer is easy. There're actually hundreds of kinds of cold viruses out there. You never know which one you will get, so there isn't a cure for each one. When a virus attacks your body, your body works hard to get rid of it. Blood rushes to your nose and causes a blockage in it. You feel terrible because you can't breathe well, but your body is actually eating the virus. Your temperature rises and you get a fever, but the heat of your body is killing the virus. You also have a running nose to stop the virus from getting into your cells. [34] You may feel miserable, but actually y9ur wonderful body is doing everything it can to kill the cold. Different people have different remedies for colds. In the United States and some other countries, for example, people might eat chicken soup to feel better. Some people take hot bath and drink warm liquids. Other people take medicines to relieve various symptoms of colds. There is one interesting thing to note. [35] Some scientists say taking medicines when you have a cold is actually bad for you. The virus stays in you longer, because your body doesn't develop a way to fight it and kill it.

(30)

A．They haven't devoted as much energy to medicine as to space travel.

B．There are too many kinds of cold viruses for them to identify.

C．It is not economical to find a cure for each type of cold.

D．They believe people can recover without treatment.

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第10题

根据材料回答下列各题： Tiny Invaders The human body is truly amazing．It allows US to sense

the world around US，to do work and have fun，and to move from place to place．In fact，the human body does its work so well that most people don’t think about it very much一until they get sick． The germs(致病菌)that make people sick are everywhere．You can’t see them,but they’re there．They’re sitting on your desk．They’re hiding on your computer’S keyboard．They’re even in the air that you are breathin9．There are two types of germs：viruses and bacteria(细菌)．Viruses are germs that can only live inside animals or plants．Viruses cause illnesses such as flu and measles(麻疹)．Bacteria are tiny creatures．Some bacteria are good．They can help your stomach break down food． Other bacteria aren’t so good．They can make you sick．Bacteria can cause sore throats(喉痛)and ear infections． How can you stop these tiny invaders from making you sick？Your skin is the first defense against germs．You can prevent some illnesses simply by washin9，with soap and water．But germs can still enter the body through small cuts in the skin or through the mouth，eyes，and nose． Once germs are inside your body，your immune(免疫的)system tries to protect you．It looks for and destroys germs．How does it do that？Special cells patrol your body．Some of these cells actually eat germs!Other cells make antibodies．An antibody sticks to a germ．There is a different antibody for each kind of germ．Some antibodies keep germs from making you sick．Others help your body find and kill germs．After a germ is destroyed，the antibodies stay in your body．They protect you if the same kind of germ comes back．That way you will not get the same illness twice． You can keep your body healthy by eating a nutritious(有营养的)diet to make your immune system strong．You can also help your immune system fight germs by getting vaccinated(接种)．Vaccines are medicines．They contain germs that have been killed or weakened．The dead germs can’t make you sick．Instead，they cause your body to make antibodies．If the same germ ever shows up again, then your antibodies attack it． Viruses can only live inside people or animals．

A.Right

B.Wrong

C.Not mentioned

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"Other viruses modify the operating system in order to camouflage their existence," the wo