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During the 19th century, scientists found that when certain parts of the brain of a pe

rson were hurt, he would lose the power of doing certain things. And so people thought that each part of the brain does a different job. But modem research discovered that this is not so, for it is not easy to show exactly what each part of the brain does. In the past fifty years there has been a great increase in the amount of research done on the brain. Scientists have found out the way the brain works is not so simple as people in general may think. Chemists fell us that about 100 000 chemical changes take place in the brain every second. Some recent researches also suggest that we can remember everything that happens to us. We, may not be able to think of the things we have heard and seen, but it is kept there in the storehouse (宝库 ) of the human brain. Earlier scientists thought that is not true. As long as the brain is given plenty of exercise, it keeps its power. It has been proved that an old person who has always been active in the mind has a quicker mind than a young person who has only done physical work without using much of his brain.

1.In the 19th century, scientist found that a person would lose the power to do certain things()

A、when he got weaker in health

B、if certain parts of his brain were hurt

C、after he did a quite different job

D、when he grew older

2.Scientists today are still unable to show exactly()

A、what each part of the brain is doing

B、how many chemical changes take place in the brain each second

C、whether each part of the brain does the same job

D、which part of the brain is the most important

3.It has been found that one's brain usually works ()

A、faster when he is old

B、a little now and a little then

C、in a very simple way

D、more complicated than we thought

4.Which of the following is NOT true according to the text?()

A、Scientists are working hard at the researches on the brain.

B、As many as six million chemical changes take place in the brain every minute.

C、A young man doing physical labor is sure to have a much slower min

D、Even an old man may have a quick mind if his brain is given much exercise.

5.The more work we give to our brains()

A、the less result we will gain

B、the more work they are able to do

C、the weaker their power will get

D、the more tired they will feel

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更多“During the 19th century, scien…”相关的问题
第1题
Sundback's zipper came into being during the 19th century.A.YB.NC.NG

Sundback's zipper came into being during the 19th century.

A.Y

B.N

C.NG

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第2题
During the 19th century, the monopoly on tea exports from China is______.

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第3题
During the 19th century, opportunities for women to work outside the household increased
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第4题
听力原文:The great acrobat, Blondin, was very famous in the 19th century. He used to walk

听力原文: The great acrobat, Blondin, was very famous in the 19th century. He used to walk on a tight-rope across the Niagara Falls. On September 8th, 1860, a crowd of about 300,000 people gathered at Niagara to watch.

Blondin carried a man across! Three men had offered to go with him, but they failed to appear, so Blondin asked his manager, Mr. Colcord, to climb on his back. Colcord agreed to do this so as not to disappoint the crowd, but he was terrified. The crossing was very difficult because Colcord was heavier than Blondin thought. After he had gone a short way, Blondin had to stop in order to rest. He asked Colcord to get down. At first Colcord refused, but at last he had to. He clung to Blondin's leg and the rope in order not to fall. Blondin had to stop six times during the crossing so as to rest. Sometimes the ropes swung as much as 40 feet! At last both men crossed safely. The crowd sighed with relief--and so did poor Mr. Colcord!

(30)

A.About 30,000.

B.Around 300,000.

C.Over 300,000.

D.More than 330,000.

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第5题
HighwaysEarly in the 20th century, most of the streets and roads in the U.S. were made of

Highways

Early in the 20th century, most of the streets and roads in the U.S. were made of dirt, brick, and cedar wood blocks. Built for horse, carriage, and foot traffic, they were usually poorly cared for and too narrow to accommodate(容纳)automobiles.

With the increase in auto production, private turnpike(收费公路)companies under local authorities began to spring up, and by 1921 there were 387,000 miles of paved roads. Many were built using specifications of 19th century Scottish engineers Thomas Telford and John MacAdam(for whom the macadam surface is named), whose specifications stressed the importance of adequate drainage. Beyond that, there were no national standards for size, weight restrictions, or commercial signs. During World War I, roads throughout the country were nearly destroyed by the weight of trucks. When General Eisenhower returned from Germany in 1919, after serving in the U. S. Army's first transcontinental motor convoy(车队), he noted: "The old convoy had started me thinking about good, two-lane highways, but Germany's Autobahn or motorway had made me see the wisdom of broader ribbons across the land."

It would take another war before the federal government would act on a national highway system. During World War II, a tremendous increase in trucks and new roads were required. The war demonstrated how critical highways were to the defense effort. Thirteen per cent of defense plants received all their supplies by truck, and almost all other plants shipped more than half of their products by vehicle. The war also revealed that local control of highways had led to a confusing variety of design standards. Even federal and state highways did not follow basic standards. Some states allowed trucks up to 36,000 pounds, while others restricted anything over 7,000 pounds. A government study recommended a national highway system of 33,920 miles, and Congress soon passed the Federal-Aid Highway Act of 1944, which called for strict, centrally controlled design criteria.

The interstate highway system was finally launched in 1956 and has been hailed as one of the greatest public works projects of the century. To build its 44,000-mile web of highways, bridges, and tunnels, hundreds of unique engineering designs and solutions had to be worked out. Consider the many geographic features of the country: mountains, steep grades, wetlands, rivers, deserts and plains. Variables included the slope of the land, the ability of the pavement to support the load, the intensity of road use, and the nature of the underlying soil. Urban areas were another problem. Innovative designs of roadways, tunnels, bridges, overpasses, and interchanges that could run through or bypass urban areas soon began to weave their way across the country, forever altering the face of America.

Long-span, segmented-concrete, cable-stayed bridges such as Hale Boggs in Louisiana and the Sunshine Skyway in Florida, and remarkable tunnels like Fort McHenry in Maryland and Mt. Baker in Washington, met many of the nation's physical challenges. Traffic control systems and methods of construction developed under the interstate program soon influenced highway construction around the world, and were invaluable in improving the condition of urban streets and traffic patterns.

Today, the interstate system links every major city in the U. S. , and the U. S. with Canada and Mexico. Built with safety in mind, the highways have wide lanes and shoulders, dividing medians or barriers, long entry and exit lanes, curves engineered for safe turns, and limited access. The death rate on highways is half that of all other U. S. roads(0.86 deaths per 100 million passenger miles compared to 1.99 deaths per 100 million on all other roads).

By opening the North American continent, highways have enabled consumer goods and services to reach people in remote and rural areas of t

A.Y

B.N

C.NG

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第6题
During McDonald's early years French fries were made from scratch every day. Russet Burban
k potatoes were【C1】______, cut into shoestrings, and fried in its kitchens.【C2】______the chain expanded nationwide, in the mid-1960s, it sought to【C3】______labour costs, reduce the number of suppliers, and【C4】______that its fries tasted the same at every restaurant. McDonald's began【C5】______to frozen French fries in 1966—and few customers noticed the difference.【C6】______, the change had a profound effect【C7】______the nation's agriculture and diet. A familiar food had been transformed into a highly processed industrial【C8】______McDonald's fries now come from huge manufacturing plants【C9】______can process two million pounds of potatoes a day. The expansion【C10】______McDonald's and the popularity of its low-cost, mass-produced fries changed the way Americans eat.

The【C11】______of McDonald's French fries played a【C12】______role in the chain's success—fries are much more profitable than hamburgers—and was【C13】______praised by customers, competitors, and even food critics. Their【C14】______taste does not stem【C15】______the kind of potatoes that McDonald's【C16】______, the technology that processes them, or the restaurant equipment that fries them: other chains use Russet Burbank, buy their French fries from the【C17】______large processing companies, and have similar【C18】______in their restaurant kitchens. The taste of a French fry is【C19】______determined by the cooking oil. For decades McDonald's cooked its French fries in a mixture of about 7 per cent cottonseed oil and 93 per cent beef fat. The mixture gave the fries their unique【C20】______.

【C1】

A.scaled

B.stripped

C.peeled

D.sliced

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第7题
During McDonald's early years French fries were made from scratch every day. Russet Burban
k potatoes were【C1】______, cut into shoestrings, and fried in its kitchens.【C2】______the chain expanded nationwide, in the mid-1960s, it sought to【C3】______labour costs, reduce the number of suppliers, and【C4】______that its fries tasted the same at every restaurant McDonald's began【C5】______to frozen French fries in 1966--and few customers noticed the difference.【C6】______, the change had a profound effect【C7】______the nation's agriculture and diet. A familiar food had been transformed into a highly processed industrial【C8】______.McDonald's fries now come from huge manufacturing plants【C9】______can process two million pounds of potatoes a day. The expansion【C10】______McDonald's and the popularity of its low-cost, mass-produced fries changed the way Americans eat.

The【C11】______of McDonald's French fries played a【C12】______role in the chain's success--fries are much more profitable than hamburgers--and was【C13】______praised by customers, competitors, and even food critics. Their【C14】______taste does not stem【C15】______the kind of potatoes that McDonald's【C16】______, the technology that processes them, or the restaurant equipment that fries them: other chains use Russet Burbank, buy their French fries from the【C17】______large processing companies, and have similar【C18】______in their restaurant kitchens. The taste of a French fry is【C19】______determined by the cooking oil. For decades McDonald's cooked its French fries in a mixture of about 7 per cent cottonseed oil and 93 per cent beef fat. The mixture gave the fries their unique【C20】______.

【C1】

A.scaled

B.stripped

C.peeled

D.sliced

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第8题
Comparisons were drawn between the development of television in the 20th century and the d
iffusion of printing in the 15th and 16th centuries. Yet much had happened【C1】______. As was discussed before, it was not【C2】______the 19th century that the newspaper became the dominant pre-electronic【C3】______, following in the wake of the pamphlet and the book and in the【C4】______of the periodical. It was during the same time that the communications revolution【C5】______up, beginning with transport, the railway, and leading【C6】______through the telegraph, the telephone, radio, and motion pictures【C7】______the 20th-century world of the motor car and the air plane. Not everyone sees that process in【C8】______. It is important to do so.

It is generally recognized,【C9】______, that the introduction of the computer in the early 20th century,【C10】______by the invention of the integrated circuit during the 1960s, radically changed the process,【C11】______its impact on the media was not immediately【C12】______As time went by, computers became smaller and more powerful, and they became "personal", too, as well as【C13】______, with display becoming sharper and storage【C14】______increasing. They were thought of, like people,【C15】______generations, with the distance .between generations much【C16】______.

It was within the computer age that the term "information society" began to be widely used to describe the【C17】______within which we now live. The communications revolution has【C18】______both work and leisure and how we think and feel both about place and time, but there have been【C19】______views about 'its economic, political, social and cultural implications. "Benefits" have been weighed【C20】______"harmful" outcomes. And generalizations have proved difficult.

【C1】

A.between

B.before

C.since

D.later

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第9题
Americans this year will swallow 15 000 tons of aspirin, one of the safest and most effect
ive drags invented by man. As the most popular medicine in the world today, it is an effective pain reliever. Its bad effects are relatively mild, and it is cheap.

For millions of people suffering from arthritis, it is the only thing that works. Aspirin, in short, is truly the 20th century wonder drug. It is also the second largest suicide drug and is the leading cause of poisoning among children. It has side effects that, although relatively mild, are largely unrecognized among users.

Although aspirin was first sold by a German company in 1899, it has been around much longer than that. Hippocrates, in ancient Greece, understood the medical value of the leaves and tree bark which today are known to contain salicylates, the chemical in aspirin. During the 19th century, there was a great deal of experimentation in Europe with this chemical, and it led, to the introduction of aspirin. By 1915, aspirin tablets were available in the United States.

A small quantity of aspirin (two five-grain tablets) relieves pain and intimation. It also reduces fever by interfering with 'some of the body' s reactions. Specifically, aspirin seems to slow down the formation of the acids involved in pain and the complex chemical reactions that cause fever. The chemistry of these acids is not fully under stood, but the slowing effect of aspirin is well-known.

A small is very irritating to the stomach lining, and many aspirin takers complain about upset stomach. There is a right way and a wrong way to take aspirin. The best way is to chew the tablets before swallowing them with water, but few people can stand the bitter taste. Some people suggest crushing the tablets in milk or orange juice and drinking that.

In which year was aspirin first sold?

A.This year.

B.1899

C.1915

D.The 19th century.

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第10题
听力原文:Today I'm going to discuss transportation and communication in the early 19th cen

听力原文: Today I'm going to discuss transportation and communication in the early 19th century in the United States. At that time, inland waterways provided North America's most popular form. of long distance transportation. Travel by river was often more convenient than taking a wagon over primitive country roads, especially when shipping heavy loads of farm products or household goods, Where the natural water ways were inadequate, shallow canals were built. The Erie Canal, opened in 1825, connected the Great Lakes with the upper Hudson River. It allowed settlers in the Great Lakes region to send their crops eastward to New York City at the mouth of the Hudson at a much lower cost. From there, crops could be shipped to other Atlantic ports. The construction of the Erie Canal also encouraged westward migration along inland waterways and helped populate the frontier. The City of Detroit grew up between two of the Great Lakes. Later a canal joined the Great Lakes with the Mississippi river system and Chicago became a thriving city. Politically the waterway system united the nation in a way few had imagined possible. By the mid-1800's faster and cheaper railroads became more popular and the canal system de dined. Railroads could be used year round whereas canals were often frozen in the winter. During the first third of the century, however, transportation on rivers, lakes and canals aided greatly in the growth of the United States. Next week we'll discuss the railroads in greater detail.

(33)

A.The role of inland waterways in the nation's growth.

B.The development of New York City as a seaport.

C.The growth of the railroads.

D.The disappearance of the canal system.

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第11题
The American victory in the Revolutionary War united 13 of the English-speaking settlements into the largest and most powerful political unit in the territory , even

The American victory in the Revolutionary War united 13 of the English-speaking settlements into the largest and most powerful political unit in the territory , even though those first 13 states hugging the eastern coast seem small compared with the country' s eventual size. As a result of the Revolution ,approximately 71 , 500 people out of a population of some 2. 5 million fled the new United States. Some were Loyalists - political or economic refugees whose loyalties to Great Britain remained strong; others were blacks seeking refuge from slavery. Immigration and the commercial slave trade after the war quickly restored the population to its former level. The Revolution also opened up the area west of the Appalachian Mountains to settlement , as fur traders and farmers were no longer confined by British settlement restrictions. Pioneering citizens , immigrants , and slaves moved west , displacing Native Americans who had hoped to preserve their cultures undisturbed by the expanding United States.

The 17th and 18th centuries saw a growing importation of Africans into North America. After 1808 U. S. law forbade the importation of slaves from abroad , although some smuggling of slaves continued. Few people from Africa chose to come to the United States voluntarily (the free African population was small) because they were considered second-class citizens , and confined largely to the northern states. Large numbers of Europeans migrated to the United States in the early national period , drawn by the promise of freedom , cheap land in the West , and jobs in the first factories of the emerging industrial age. The influx of Europeans , the end of the slave trade , and the ongoing wars removing Native Americans meant that some of the racial diversity of the population was diminishing. By the early decades of the 19th century , a greater proportion of Americans were of western European and Protestant heritage than at the time of the Revolution.

Over the course of the 19th century , the United States gradually absorbed the French colonists in the upper Midwest and in New Orleans , Louisiana; the Spanish and Russian colonists in the South , West ,and Northwest; and the territories of the Hawaiian people and other indigenous groups. Sometimes these territories were added by diplomacy , sometimes by brute force. European visitors were surprised at the diversity in nationalities and in religious and secular beliefs in early America , as well as the number of intermarriages between people of differing European heritages. There were also cross-racial births , sometimes voluntary and sometimes by force , but rarely within legal marriages. The population continued to grow through migration as well , driven in part by English , Irish , and German settlers who came in large numbers around 1848 to escape political repression and food shortages in Europe.

31. The American independence made all of the following leave the new country EXCEPT ()

A. those who were hostile to the old colonialists

B. pro-British colonialists loyal to the old political system

C. those attempting to free themselves from slavery

D. those who fled on account of economic problems caused by birth of the new nation

32. It can be inferred from the passage that ()

A. slavery was soon abolished after the victory of the American Revolution

B. people didn't enjoy freedom of settlement in the West before the Revolutionary War

C. native Americans moved abroad in large numbers during the War

D. the western expansion destroyed the environmental conditions in those areas

33. Which of the following stopped the influx of Africans into the United States in the first decade of the 19th century? ()

A. Large numbers of European immigrants.

B. Some smuggling slaves.

C. Legislation by the government.

D. Second-class citizens.

34. By (), the United States succeeded in obtaining vast land from other colonies during the 19th century.

A. military action and re-settlement

B. negotiations and re-settlement

C. military action and negotiations

D. negotiations and industrialization

35. Implied , but not directly stated , is the fact that () in early America.

A. there appeared to be many diverse nationalities

B. numerous different religions existed

c. marriages between European descendants were commonplace

D. marriages between different races were not encouraged or accepted

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