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[主观题]

第三篇Sunspots It's not surprising that sunspots(太阳黑子)were observed by ancient astrono

第三篇

Sunspots

It's not surprising that sunspots(太阳黑子)were observed by ancient astronomers(天文学家).The largest sunspots on the sun can be seen without a telescope.1t was not until the invention of the telescope(望远镜)in the early l7th century,however,that systematic studies of sunspots could be undertaken.The great astronomer Galileo was among the first to make telescopic observations of sunspots.

Sunspots are regions of extremely strong magnetic fields(磁场)found on the sun's surface.A sunspot has a dark central core known as the umbra.The umbra is surrounded by a dark ring called the penumbra.where the magnetic field spreads outward.Sunspots appear dark because they are giving off less radiation.They are cooler than the rest of the sun's surface.

Sunspots are frequently observed in pairs or in paired groups.The members of a spot pair are identified as the leading spot and the following spot.They are identified by their position In the pair In terms of the direction in which the sun rotates(旋转).

The number of sunspots at any one time varies.A large spot group may consist of as many as 10 groups and 300 spots across the sun.The number of spots changes in a fairly regular pattern called the sunspot cycle.The largest number occurs about every 11 years.At sunspot minimum, there are at most just a few small spots.

The average lifetime of an individual spot group is roughly one solar rotation.which is about 25 days.The most persistent large spots, however, can survive for two to three months.

41 Careful observations and systematic studies of sunspots

A were made by ancient astronomers.

B started in the early 17th century.

C were made by Galileo only.

D could be made without a telescope.

答案
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更多“第三篇Sunspots It's not surprising that sunspots(太阳黑子)were observed by ancient astrono”相关的问题

第1题

Sunspots are cooler than the rest of the sun's surface becauseA.they produce less energy.B

Sunspots are cooler than the rest of the sun's surface because

A.they produce less energy.

B.they are buried in the sun.

C.they are far away from magnetic fields.

D.they are close to magnetic fields.

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第2题

42 Sunspots are cooler than the rest of the sun' s surface becauseA they produce less ener

42 Sunspots are cooler than the rest of the sun' s surface because

A they produce less energy.

B they are buried in the sun.

C they are far away from magnetic fields.

D they are close to magnetic fields.

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第3题

Some physicists have proposed that sunspots and solar wind have negligible effects on the
earth's weather.

A.undetermined

B.insignificant

C.unusual

D.indisputable

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第4题

SunspotsIt's not surprising that sunspots (太阳黑子) were observed by ancient astronomers

Sunspots

It's not surprising that sunspots (太阳黑子) were observed by ancient astronomers (天文学家). The largest sunspots on the sun can be seen without a telescope. It was not until the invention of the telescope (望远镜) in the early 17th century, however, that systematic studies of sunspots could be undertaken. The great astronomer Galileo was among the first to make telescopic observations of sunspots.

Sunspots are regions of extremely strong magnetic fields (磁场) found on the sun's surface. A sunspot has a dark central core known as the umbra. The umbra is surrounded by a dark ring called the penumbra, where the magnetic field, spreads outward. Sunspots appear dark because they are giving off less radiation. They are cooler than the rest of the sun's surface.

Sunspots are frequently observed in pairs or in paired groups. The members of a spot pair are identified as the leading spot and the following spot. They are identified by their position in the pair in terms of the direction in which the sun rotates (旋转).

The number of sunspots at any one time varies. A large spot group may consist of as many as 10 groups and 300 spots across the sun. The number of spots changes in a fairly regular pattern called the sunspot cycle. The largest number occurs about every 11 years. At sunspot minimum, there are at most just a few small spots.

The average lifetime of an individual spot group is roughly one solar rotation, which is about 25 days. The most persistent large spots, however, can survive for two to three months.

Careful observations and systematic studies of sunspots

A.were made by ancient astronomers.

B.started in the early 17th century.

C.were made by Galileo only.

D.could be made without a telescope.

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第5题

请根据短文内容,回答题。 Sunspots (太阳黑子)It&39;s not surprising that sunspots were observ

请根据短文内容,回答题。

Sunspots (太阳黑子)

It&39;s not surprising that sunspots were observed by ancient astronomers (天文学家) . The largest sunspots on the sun can be seen without a telescope. It was not until the invention of the telescope (望远镜) in the early 17th century, however, that systematic studies of sunspots could be undertaken. The great astronomer Galileo was among the first to make telescopic observations of sunspots.<br>

Sunspots are regions of extremely strong magnetic fields (磁场) found on the sun&39;s surface. A sunspot has a dark central core known as the umbra. The umbra is surrounded by a dark ring called the penumbra, where the magnetic field spreads outward. Sunspots appear dark because they are giving off less radiation. They are cooler than the rest of the sun&39;s surface.<br>

Sunspots are frequently observed in pairs or in paired groups. The members of a spot pair are identified as the leading spot and the following spot. They are identified by their position in the pair in terms of the direction in which the sun rotates (旋转) .<br>

The number of sunspots at any one time varies. A large spot group may consist of as many as 10 groups and 300 spots across the sun. The number of spots changes in a fairly regular pattern called the sunspot cycle. The largest number occurs about every 11 years. At sunspot minimum, there are at most just a few small spots.<br>

The average lifetime of an individual spot group is roughly one solar rotation, which is about25 days. The most persistent large spots, however, can survive for two to three months.

Careful observations and systematic studies of sunspots __________. 查看材料

A.were made by ancient astronomers

B.started in the early 17th century

C.were made by Galileo only

D.could be made without a telescope

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第6题

第三篇A Debate on the English Language A measure declaring English the national language

第三篇

A Debate on the English Language

A measure declaring English the national language is under intense debate in the United States.The US Senate passed two declarations last week.One calls English the nation's official language and the other says it is the “common and unifying(统一的)”tongue.But Americans found themselves divided on the issue.

Since people worldwide know that most Americans speak only English,many can't understand why the issue is so controversial(有争议的).

“The discussion is related to fears of immigration issues,”says Dick Tucker,a social scientist at Pittsburgh's Carnegie Mellon University.“It's related to a worry about the changing demography(人口统计)of the US.It's a worry about who will continue to have political and economic influence.”报关员考试

In fact,the notion of protecting the language has been kicked around almost since the nation's founding.John Adams lobbied(游说)in 1780 for the creation of a national academy to correct and improve the English language.But his proposal died,since lawmakers saw it as a royalist(保皇主义者)attempt to define personal behavior.

Since then,the country hasn't had a national language,but the idea of recognizing the special status of English lived on.

The emotions surrounding language resurface(再次浮现)not because people feel comfortable with English.It is more about the discomfort many Americans feel with the new languages,says Walt Wolfram,a professor at North Carolina State University.

“Language is never about language,”he says.

According to the 2000 US Census Bureau report,of 209 million Americans over 18 years old,172 million speak only English at home.About 37 million speak languages other than English.Among them,6.5 million speak poor English and 3.1 million don't speak English at all.

41.What are the two declarations concerned with?

A.The status of the English language.

B.The protection of new languages.

C.The rights to speak one's mother tongue.

D.The improvement of the English language.

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第7题

第三篇More About Alzheimer's Disease Scientists have developed skin tests that may be used

第三篇

More About Alzheimer's Disease

Scientists have developed skin tests that may be used in the future to identify people with Alzheimer's disease and may ultimately allow physicians to predict who is at risk of getting this neurological disorder.

The only current means of diagnosing the disease in a living patient is a long and expensive series of tests that eliminate every other cause of dementia.

"Since Alois Alzheimer described the disease nearly a century ago, people have been trying to find a way to accurately diagnose it in its early stages," said Patricia Grady, acting director of the National Institute of Neurological Disorders and Stroke in Bethesda, Maryland. "This discovery, if confirmed, could prove a big step forward in our efforts to deal with and understand the disease."

Alzheimer's is the single greatest cause of mental deterioration in older people, affecting between 2.5 million and 4 million people in the United States alone. The devastating disorder gradually destroys memory and the ability to function, and eventually causes death. There is currently no known treatment for the disease.

Researches discovered that the skin cells of Alzheimer's patients have defects that interfere with their ability to regulate the flow of potassium in and out of the cells. The fact that the cell defects are present in the skin suggests that Alzheimer's results from physiological changes throughout the body, and that dementia may be the first noticeable effect of these changes as the defects affect the cells in the brain, scientists said.

The flow of potassium is especially critical in cells responsible for memory formation. The scientists also found two other defects that affect the cells' supply of calcium, another critical element.

One test developed by researchers calls for growing skin cells in a laboratory culture and then testing them with an electrical detector to determine if the microscopic tunnels that govern the flow of potassium are open. Open potassium channels create a unique electrical signature.

A spokesman for the Alzheimer's association said that if the validity of the diagnostic test can be proven it would be important development, but cautioned that other promising tests for Alzheimer's have been disappointing.

The newly developed skin tests may be used in the future to allow doctors to ______.

A. cure those with Alzheimer's disease

B. discover the cause of Alzheimer's disease

C. predict who might get Alzheimer's disease

D. find the consequences of Alzheimer's disease

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第8题

第三篇Two People,Two PathsYou must be familiar with the situation:Dad’s driving,Mum’s tell

第三篇

Two People,Two Paths

You must be familiar with the situation:Dad’s driving,Mum’s telling him where to go.He’s sure that they need to turn left But she says it’s not for another two blocks.Who has the better sense of direction? Men or women.

They both do, a new study says.but in different ways.

Men and women.Canadian researchers have found,have different methods of finding their

way.Men look quickly at landmarks(地标)and head off in what they think is the right direction.

Women, however, try to picture the whole route in detail and then follow the path in their head.

“women tend to be more detailed,”said Edward Cornell.who led the study,“while men

tend to be a little bit faster and …a little bit more intuitive(直觉感知的).”

In fact, said Cornell,“sense of direction”isn’t one skill but two.

The first is the“survey method”.This is when you see all area from above, such as a printed map.Y0u can see,for example,where the hospital is,where the church is and that the

supermarket is on its right.

The second skill is the“route method”This is when you use a series of directions.You start

from the hospital,then turn left,turn fight,go uphill——and then you see the supermarket.

Men are more likely to use the survey method while women are more likely to use one route and follow directions.

Both work, and neither is better.

Some scientists insist that these different skills have a long history. They argue it is because of the difference in traditional roles.

In ancient times,young men often went far away with the older men to fish or hunt.The trip took hours or days and covered unfamiliar places.The only way to know where you were was to use the survey method to remember landmarks—the mountains, the lakes and so on.

The women,on the other hand,took young girls out to find fruits and plants.These activities were much closer to home but required learning well-used paths.So, women’s sense of

space was based on learning certain routes.

41 When finding his way, Dad tends to rely on

A his intuitive knowledge.

B his book knowledge.

C Mum’s assistance.

D the police’s assistance.

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第9题

第三篇The World Cup This summer’s World Cup competition will see teams competing to play

第三篇The World Cup

This summer’s World Cup competition will see teams competing to play the world’s best football.But the football they play will not all be of the same kind.The fans expect different styles of play from Brazil,Germany,or Italy.

What makes Brazilian football Brazilian?Our style. of playing football contrasts with the Europeans because of a combination of qualities of surprise,accuracy and good judgment.This style. has won Brazil five world cups.Yet many Brazilian fans only count four of these victories.In 1994,the team abandoned this style. for modern,scientific training and tactics.The team won the cup,but in a boring way.

The ltalians think differently.“To many ltalians,the score 0-0 has a glorious quality,suggesting perfection,”says the British football writer Simon Kuper.In the ltalian culture,the idea of face is very important.This is why ltalian teams are traditionally built around strong defences.The Dutch footballer Johan Cruyff once said that ltalian teams never exactly beat you.It’s just that you often lose to them.

In Holland,there is a tradition of decision making through argument and discussion.It is a society where everybody is expected to have a point of view.“Every Dutch player wants to control the game,”says Arnold Muhren.“You play football with your brains and not your feet.”

“A Dutch player argues,”says Simon Kuper.“An English player obeys his superior.He is a soldier.”The qualities valued in English football are military-strength,aggression and courage.This can make for exciting football.But it also means that the English find it difficult to use skillful players.David Beckham is usually criticized for his failure to defend-despite the fact that he is an attacker.

If the English like to fight,the Germans like to win.In recent years,Germany has tried to change its image as a country of ruthless efficiency and a desire for victory at all costs.But Germans are quite happy for these qualities to remain in their national football team.“Football is a simple game,”Gary Lineker once said.“You kick a ball about for ninety minutes and in the end the Germans win.”

It’s difficult to predict who will win this year’s World Cup.There is no strong favorite.But a look at the track record of previous winners shows that it is the nations with the strongest national characteristics in the football that perform. best.It seems that you need to know where you come from if you want to get to the top.

41.Which of the following is NOT a characteristic of the Brazilian style. of playing football?

A.Accuracy.

B.Surprise.

C.Good judgment.

D.Ruthless efficiency.

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第10题

第三篇In most sectors of the economy, it is the seller who attempts to attract a potential

第三篇

In most sectors of the economy, it is the seller who attempts to attract a potential buyer with various inducements of price, quality and utility, and it is the buyer who makes the decision. In the health care industry, however, the doctor-patient relation- ship is the mirror image of the ordinary relationship between producer and consumer. Once an individual has chosen to see a physician, the physician usually makes all significant purchasing decisions: whether the patient should return "nest Wednesday" whether X-rays are needed, whether drugs should be prescribed, etc.

This is particularly significant in relation to hospital care. The physician must certify the need for hospitalization, determine what procedures will be performed, and announce when the patient may be discharged. The patient may be consulted about some of these decisions, but in the main it is the doctor' s judgments that are final. Little wonder then that in the eyes of the hospital it is the physician who is the real "consumer. "As a consequence, the medical staff represents the "power center" in hospital policy and decision-making, not the administration.

Although usually there are in this situation four identifiable participants, the physician, the hospital, the patient and the payer(generally an insurance carrier or government), the physician makes the essential decision for all of them. The hospital becomes an extension of the physicians; the payer generally meets most of the bona fide bills generated by the physician/hospital and for the most part, the patient's plays a passive role. In routine or minor illness or just plain worries, the patient's options are of course, much greater with respect to use and price. But in illnesses that are of some significance, such choice tends to evaporate. And it is for these illnesses that the bulk of the health care dollar is spent. We estimate that about 75 N 80 percent of health care expenditures are determined by physicians, not patients. For this reason, economy measures directed at patients or the general public are relatively ineffective.

The author's primary purpose is______。

A. to criticize doctors for exercising too much control over patients

B. to analyze some important economic factors in health care

C. to urge hospitals to reclaim their decision-making authority

D. to inform. potential patients of their health care rights

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