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[主观题]

The idea of fighting a noise by making more noise sounds strange, but that's exactly what

motor engineers are doing in Germany and some other countries.

Car makers' research and development laboratories have already proved that mixing in more noise with the help of loudspeaker can reduce the unwanted noise.

Physicists have known about the technique for a long time. Sound is made up of pressure waves in tire air. If two sound waves of the same frequency mix so that the highest point of one wave happens at the same time as the lowest point of the other wave, the result is no sound. Therefore, by producing a perfect copy of the noise and delaying it by half a wave cycle, we can kill the unwanted noise. Using this technique many carmakers are racing to develop noise-killing systems both inside and outside the cars.

Another good thing about the use of noise-killing systems is that it saves the need for a silencer; this not only reduces the weight of a car, but also makes the motor burn less fuel and work better.

Some engineers believe that the noise-killing system will be used in most cars within a few years. But the carmakers haven't decided if they will put it into production because it would add several hundred dollars to the cost of their cars.

Which of the following gives a general idea of how the noise-killing system works？

A．By producing pressure waves going in the opposite direction.

B．By mixing high frequency sound waves with low frequency sound waves.

C．By mixing new sound waves with the noise and sending them out together.

D．By making copies of the unwanted sound waves and letting them out a little later.

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发布时间：2020-09-24

更多“The idea of fighting a noise by making more noise sounds strange, but that's exactly what”相关的问题

第1题

The main idea of the last paragraph isA. the treatment of the skin cancer.B. the preventio

The main idea of the last paragraph is

A. the treatment of the skin cancer.

B. the prevention of the skin cancer.

C. the parts of the body where cancer is most likely to develop.

D. the lotions that work best in fighting against the skin cancer.

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第2题

The main idea of the last paragraph isA．the treatment of the skin cancer.B．the prevention

The main idea of the last paragraph is

A．the treatment of the skin cancer.

B．the prevention of the skin cancer.

C．the parts of the body where cancer is most likely to develop.

D．the lotions that work best in fighting against the skin cancer.

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第3题

听力原文：Many of the innovations in fire fighting that we will be seeing today were develo

听力原文： Many of the innovations in fire fighting that we will be seeing today were developed right here in America. As you can see from these photos, one of the earliest steam powered fire engines, the Joe. Ross, was built in 1850 and operated right here in Cincinnati. Driven by four large horses, the ten-ton machine was steered by a single front wheel that was attached directly to the horse team. The steam motor on the Joe Ross was used to power the water pump that the big machine used to fight fires.

Over here, we have an actual truck which was built in 1900 by the Waterbus Fire Engine Works of Minneapolis. This was the very first fire engine to utilize a single steam motor for pulling the engine as well as pumping the water. As you may notice at the top of the truck, there is a circular platform. that holds one end of a long ladder. The revolving platform. operates almost like a record turntable in order to make it easier for ladder operators to access buildings from difficult angles. The idea of the ladder turntable is credited to a San Francisco fireman by the name of Daniel Hayes. Hayes' lifesaving invention, when combined with the relatively quick response time of the single engine, helped to bring fire fighting into the modern era.

(30)

A．Urban fires

B．American fire fighting innovations.

C．The history of fire.

D．The Great San Francisco Fire.

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第4题

New Guidelines for Fighting HIVAt the moment, four million people around the world receive

New Guidelines for Fighting HIV

At the moment, four million people around the world receive anti-retroviral drugs. There's another five million who need them but don't get them.

The WHO recommendations on when to start treatment for HIV would mean an extra three to five million people would be added to that waiting list. The WHO wants people who have HIV to start drugs before their immune systems get so weak that they start displaying symptoms. A study recently published in the medical journal The Lancet showed starting treatment at the newly recommended level could increase survival by nearly 70% .

It would also add significantly to the cost on health care systems. In South Africa, which has one of the biggest HIV burdens in the world, currently fewer than half of the people who should be receiving HIV drugs get them.

Poor health infrastructure is a common problem for nearly all developing countries. Putting HIV-positive people on drugs earlier would significantly reduce the cost to health systems of treating opportunistic infections- illnesses which take hold while the immune system is weak. It would also greatly improve life expectancy of HIV patients, with repercussions for families and the workforce. The WHO is still working out how much it would cost countries to improve their treatment regimes, but it won't be cheap.

What is the main idea of this passage？

A．It would add much more cost for the WHO to treat with people who have HIV.

B．Those people with HIV is a common problem for all developing countries.

C．Starting treatment early could increase survival opportunities for people with HIV.

D．The WHO has raised new proposals to fight against AIDS.

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第5题

Running a fever was once thought to be the prerogative of warm-blooded creatures, whose in

ternal temperatures are independent of the weather. But, as Matthew Kluger reported in "The Importance of Being Feverish" January 1976, lizards can also develop fevers, even though there is no question that they are cold-blooded. They raise their temperatures by moving into the sun or, in the case of Kluger's experiments, under a sun lamp. And it seems to do them some good. Sick lizards kept in cages at feverish temperatures fare much better than their counterparts in normal and cool environments.

Now ,fever has spread to invertebrates(无脊椎动物). Recent studies have shown that crayfish and scorpions can develop fevers. Crayfish injected with bacteria and scorpions injected with prostaglandins (前列腺素)swam and scuttled to hot areas. Prostaglandins are hormones thought to be instrumental in the development of a fever.

Evidence is also mounting that moderate fevers have their benefits, which might explain why the fever process is so widespread. Leukocytes, white blood cells that are active in fighting bacterial infections, are more mobile at febrile temperatures. And fevers reduce the amount of iron available to bacteria. That reduction, combined with high temperatures, has been shown to inhibit bacterial growth.

Which of the following best states the main idea of the passage？

A．Cold-blooded animals can develop fevers.

B．There are benefits to developing fevers.

C．Fevers inhibit bacterial growth.

D．Lizards can develop fevers.

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第6题

听力原文：The Red Cross is an international organization which cares for the people who are

听力原文： The Red Cross is an international organization which cares for the people who are in need of help. A man in a Paris hospital who needs blood, a woman in Mexico who was injured in an earthquake, and a family in India that lost their home in a storm may all be aided by the Red Cross.

(29)The Red Cross exists in almost every country around the globe. The world Red Cross organizations are sometimes called the Red Crescent, the Red Mogen David, the Sun, and the Red Lion. All of these agencies share a common goal of trying to help people in need.

(30)The idea of forming an organization to help the sick and wounded during a war started with Jean Duanat. In 1895, he observed how people were suffering on a battlefield in Italy. He wanted to help all the wounded people regardless of which side they were fighting for. The most important result of his work was an international treaty called the Geneva Convention. It protects prisoners of war, the sick and wounded, and other citizens during a war.

(31) The American Red Cross was set up by Clara Barton in 1881. Today the Red Cross in the United States provides a number of services for the public, such as helping people in need, teaching first aid, demonstrating water safety, and providing blood.

(30)

A．Red Cross workers are in many countries.

B．Red Cross only exists in the United States.

C．Red Cross is another name for world hospital.

D．Many people who are in need work in Red Cross.

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第7题

听力原文： The Red Cross is an international organization which cares for the people who ar

e in need of help. A man in a Paris hospital who needs blood, a woman in Mexico who was injured in an earthquake, and a family in India that lost their home in a storm may all be aided by the Red Cross.

The Red Cross exists in a[most every country around the globe. The world Red Cross organizations are sometimes called the Red Crescent, the Red Mogen David, the Sun, and the Red Lion. All of these agencies share a common goal of trying to help people in need.

The idea of forming an organization to help the sick and wounded during a war started with Jean Duanat. In 1895, he observed how people were suffering on a battlefield in Italy. He wanted to help all the wounded people regardless of which side they were fighting for. The most important result of his work was an international treaty called the Geneva Convention. It protects prisoners of war, tile sick and wounded, and other citizens during a war.

The American Red Cross was set up by Clara Barton in 1881. Today the Red Cross in the United States provides a number of services for the public, such as helping people in need, teaching first aid, demonstrating water safety, and providing blood.

(30)

A．Red Cross workers are in many countries.

B．Red Cross only exists in the United States.

C．Red Cross is another name for world hospital.

D．Many people who are in need work in Red Cross.

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第8题

No species has developed a closer relationship with humanity than the dog, though cat-love

rs may disagree. But that relationships basis — what it is about dogs that allows them to live【C1】______ with people — is still【C2】______ understood. After all, dogs are【C3】______ from wolves, which are big, scary carnivores that would certainly have【C4】______ with early man for prey, and【C5】______ have been averse to the occasional human as a light snack. 【C6】______ specifically bred for fighting, dogs are more docile than wolves, so that is【C7】______ part of the answer. But mere docility cannot【C8】______ for why people like to have dogs in their homes. Sheep are【C9】______, but few people keep them as pets. Brian Hare, of Harvard University, thinks he knows. And, as he told the American Association for the Advancement of Science meeting in Seattle, it does not【C10】______ well on the intelligence of mankinds closest living【C11】______, the chimpanzee. Dr. Hares hypothesis is that dogs are superbly【C12】______ to social cues from people. That【C13】______ them to fit in with human society. On one【C14】______, this might sound common sense. But humans are such【C15】______ animals that they frequently【C16】______ to realize just how unusual are their own【C17】______ at communicating. Dr. Hare【C18】______ decided to test his idea by【C19】______ the abilities of dogs with those of chimpanzees,【C20】______ are often regarded as second only to people in their level of innate intelligence.

【C1】

A．at present

B．at difference

C．at ease

D．at distance

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第9题

It is physically impossible for a well-educated, intellectual（理性的), or brave man to mak

It is physically impossible for a well-educated, intellectual(理性的), or brave man to make money the chief of his thoughts; as physically impossible as it is for him to make his dinner the principal object of them. All healthy people like their dinner, but their dinner is not the main object of their lives. So all healthy-minded people like making money but the main object of their lives is not money; it is something better than money.

A good soldier, for instance, mainly wishes to do his fighting well. He is glad for his pay very properly so, and justly grumbles (抱怨) when you keep him ten months without it; still his main motion of his life is to win battles, not to be paid for winning them.

So of doctors. They like fees no doubt-ought to like them; yet if they are brave and well-educated, the entire object of their lives is not fees. They, on the whole, desire to cure the sick, and they are good doctors, and the choices were fairly put to them would rather cure their patients and lose their fees than kill him and get it. And so with all other brave and rightly trained men, their work is first, their fee second, very important always, but still second.

The main idea of the text is that _______.

A．people can't live without money.

B．money is as important as work.

C．the main object of the people's lives should not be money but work.

D．the entire object of the people's lives is making money.

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