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Many pure metals have little use because they are too soft, rust too easily, or have some

other ______ .

A．bruises

B．blunders

C．handicaps

D．drawbacks

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更多“Many pure metals have little u…”相关的问题

第1题

up, in, on, lotus, draped, rest, muck, untouched, picked, fantasies, pristineThen ,hav

up, in, on, lotus, draped, rest, muck, untouched, picked, fantasies, pristine

Then ,having started the wash, and reflecting ___1__ the symbol of the ___2___ in Oriental philosophy which rises, pure and ____3__ from the mud and __4___ ,I walked proud and __5___ among the gym trunks and sweatshirts, and out into the___6__ of the house to tidy it ____7__.There I indulged in aggressive ____8__ against my dear family as I __9__ up a necktie __10__ on the lamp.

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第2题

A．Drags have caused American people to have no enough drags of medical use.B．Drugs hav

A．Drags have caused American people to have no enough drags of medical use.

B．Drugs have mined many American people's mind.

C．Drags have caused many American people to lose health.

D．Both B and C.

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第3题

Humans are the dominant (统治) species on planet Earth. Their numbers are increasing r

apidly. They are no longer restricted by their environment, as they can live in the most hostile of deserts or the bitter cold of Antarctic.Human culture is heavily based on the earth's natural resources -- oil, coal and metals; soil, water and forests. Industrialized society is using increasing amounts of these resources each year. Governments and industrialists strive for economic growth -- for factories and mines to produce more each year than they did in the previous year. But fuels and metals and, to a lesser extent, the soil are nonrenewable resources. Once used they are gone forever. In many cases the lifetime of these resources is coming to an end.Factories and machines create wastes. These wastes are poured into the atmosphere, the water and even into the soil. The damaging effect of this pollution is, in some cases, permanent. To reduce pollution creates further problems. Factories may have to be redesigned or even pulled down. This costs money and may mean loss of livelihood (生计) for many workers.Modern technology is creating an additional problem -- it is making industry more and more automatic (自动化 . This means that fewer and fewer people are needed to operate factories and offices. The consequent loss of jobs is a worldwide problem and western society is still struggling to find the answer.This introduction gives you some idea of the topics to be discussed in detail in this chapter.

1.This passage is most probably written as ____.

A、the beginning part of a certain chapter

B、the middle part of a certain chapter

C、the last part of a certain chapter

D、a self-contained chapter

2.Which of the following topics is NOT discussed in the passage？ ____

A、Natural Resources

B、Industrial Pollution

C、Unemployment

D、Overpopulation

3.The author's purpose in the first paragraph is to tell us the fact that ____.

A、deserts are hostile

B、Antarctic is very cold

C、human beings now inhabit the entire Earth

D、there are many different species on planet Earth

4.According to the passage, some natural resources like fuels and metals ____.

A、are no longer new

B、will never be gone

C、will soon be used up

D、can not be used at present

5.The phrase `strive for' in the second paragraph means ____.

A、fight with each other in order to get'

B、make great efforts to achieve'

C、have a violent struggle because of'

D、suffer a lot from'

6.Which pollution is NOT mentioned in the passage？ ____

A、Air Pollution

B、Water Pollution

C、Soil Pollution

D、Sound Pollution

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第4题

听力原文：W: Waiting in line to copy just one page of an article wastes so much time.M: Hav

听力原文：W: Waiting in line to copy just one page of an article wastes so much time.

M: Have you ever tried the photocopier on the third floor of the library？ I don't think as many people know about it.

Q: What does the man suggest the woman do？

(16)

A．Have her copies made outside the library.

B．Use a different machine to make her copies.

C．Read the article while she waits in line.

D．Look for a different magazine article.

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第5题

Successful innovations have driven many older technologies to extinction and have resulted

in higher productivity, greater consumption of energy, increased demand for raw materials, accelerated flow of materials through the economy and increased quantities of metals and other substances in use per person. The history of industrial development is full of examples. In 1870, horses and mules were the prime source of power on U.S. farms. One horse or mule was required to support four human beings--a ratio that remained almost constant for many decades. At that time, had a national commission been asked to forecast the horse and mule population for 1970, its answer probably would have depended on whether its consultants were of an economic turn of mind. Had they been "economists", they would have recognized that the power of steam had already been harnessed to industry and to land and ocean transport. They would have recognized further that would be only a matter of time before steam would be the prime source of power on the farm. It would have been difficult for them to avoid the conclusion that the horse and mule population would decline rapidly.Which of the following is NOT mentioned by the author as a consequence of new technological developments？A.Older technologies die away.B.The quality of life is improved.C.Overall productivity increases.D.More raw materials become necessary.

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第6题

Salt, shells or metals are still used as money in out-of-the-way parts of the world today.

Salt may seem rather a strange 【B1】 to use as money, 【B2】 in countries where the food of the people is mainly vegetable, it is often an 【B3】 necessity. Cakes of salt, stamped to show their 【B4】 , were used as money in some countries until recent 【B5】 and cakes of salt 【B6】 buy goods in Borneo and parts of Africa. Sea shells 【B7】 as money at some time 【B8】 another over the greater part of the Old World. These were 【B9】 mainly from the beaches of the Maldives Islands in the Indian Ocean, and were traded to India and China. In Africa, shells were traded right across the 【B10】 from East to West. Metal, valued by weight, 【B11】 coins in many parts of the world. Iron, in lumps, bars or rings, is still used in many countries 【B12】 paper money. It can either be exchanged 【B13】 goods, or made into tools, weapons, or ornaments. The early money of China, apart from shells, was of bronze, 【B14】 in flat, round pieces with a bole in the middle, called "cash". The 【B15】 of these are between three thousand and four thousand years old--older than the earliest coins of the easterr Mediterranean. Nowadays, coins and notes have 【B16】 nearly all the more picturesque 【B17】 of money, and 【B18】 in one or two of the more remote countries people still keep it for future use on ceremonial 【B19】 such as weddings and funerals, examples of 【B20】 money will soon be found only in museums.

【B1】

A．object

B．article

C．substance

D．category

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第7题

Chemistry did not emerge as a science until after the scientific revolution in the sevente

enth century and then only rather slowly and laboriously. But chemical knowledge is as old as history, being almost entirely concerned with the practical' arts of living. Cooking is essentially a chemical process; so is the inching of metals and the administration of drugs and potions. This basic chemical knowledge, which was applied in most cases as a rule of thumb, was nevertheless dependent on previous experiment. It also served to stimulate a fundamental curiosity about the processes themselves. New information was always being gained as artisans improved techniques to gain better results.

The development of a scientific approach to chemistry was, however, hampered by several factors. The most serious problem was the vast range of material available and the consequent difficulty of organizing it into some system. In addition, there 'were social and intellectual difficulties, chemistry is nothing if not practical, those who practice it must use their hands, they must have a certain practical flair. Yet in many ancient civilizations, practical tasks were primarily the province of a slave population. The thinker or philosopher stood apart from this mundane world, where the practical arts appeared to lack any intellectual content or interest.

The final problem for early chemical science was the element of secrecy. Experts in specific trades had developed their own techniques and guarded their knowledge to prevent others from stealing their livelihood. Another factor that contributed to secrecy was the esoteric nature of the knowledge of alchemists, who were trying to transform. base metals into gold or were concerned with the hunt for the elixir that would bestow the blessing of eternal life. In one sense, the second of these was the more serious impediment because the records of the chemical processes that early alchemists had discovered were often written down in symbolic language intelligible to very few or in symbols that were purposely obscure.

What is the passage mainly about？

A．The scientific revolution in the seventeenth century.

B．Reasons that chemistry developed slowly as a science.

C．The practical aspects of chemistry.

D．Difficulties of organizing chemical knowledge systematically.

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第8题

根据下面内容，回答下列各题： Salt，shells or metals are still used as money in out of- he wa

y parts of the world today．Salt may seem rather a strange(19)_______to use as money，(20)_______in countries where the food of the people is mainly vegetable，it is often an(21)_______necessity．Cakesb of salt，stamped to show their(22)_______，were used as money in some countries until recent(23)_______ ，and cakes of salt(24)_______buy goods in Borneo and parts of Africa． Sea shells(25)_______as money at some time(26)_______another over the greater part of the Old world．These were(27)_______mainly from the beaches of the Maldives Islands in the Indian Ocean，and were traded to India and China．In Africa，shells were traded tight acrossthe(28)_______from East to West． Metal，valued by weight，(29)_______ coins in many parts of the world．Iron，in lumps，bars or rings，is still used in many countries(30)_______paper money．It Can either be exchanged(31)_______goods，or made into tools，weapons，or ornaments．The early money of China，apart from shells，was of bronze，(32) _______in flat，round pieces with a hole in the middle，called“cash”．The(33) _______of these are between three thousand and four thousand years old older than the earliest coins of the eastern Mediterranean． Nowadays，coins and notes have replaced nearly all the more picturesque forms of money，and while in one or two of the more remote countries people still hold it for future use on ceremonial occasions such as weddings and funerals，examples of primitive money will soon be found only in museums．

A.object

B.article

C.substance

D.category

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第9题

听力原文：Our environment is being polluted faster than nature and man's present efforts ca

n prevent it. Time is bringing us more people, and more people will bring us more industry, more motor vehicles, larger cities, and the growing use of man-made materials.

What can explain and solve this problem？ The fact is that pollution is caused by man-by his desire for a modern way of life. We make "increasing industrialization" our chief aim. For its sake, we are willing to sacrifice every thing: clean air, pure water, good food, our health and the future of our children. There is a constant flow of people from the countryside into the cities, eager for the benefits of modern society. But as our technological achievements have grown in the last twenty years, so pollution has be come a serious problem.

Isn't it time we stopped to ask ourselves where we are going and why？ It reminds one of the stories about the airline pilot who told his passengers over the loudspeaker, "I've some good news and some bad news. The good news is that we're making rapid progress at 530 miles per hour. The bad news is that we're lost and don't know where we're going." The sad fact is that this becomes a true story when applied to our modern society.

(30)

A．We are making too many vehicles.

B．We have more and more industry.

C．There are too many developing countries.

D．People use too many man-made materials.

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第10题

Questions 1 to 5 are based on the following passage: Chemistry did not emerge as a scie

nce until after the scientific revolution in the seventeenth century and then only rather slowly and laboriously. But chemical knowledge is as old as history, being almost entirely concerned with the practical arts of living. Cooking is essentially a chemical process; so is the melting of metals and the administration of drugs and potions. This basic chemical knowledge, which was applied in most cases as a rule of thumb, was nevertheless dependent on previous experiment. It also served to stimulate a fundamental curiosity about the processes themselves. New information was always being gained as artisans improved techniques to gain better results. The development of a scientific approach to chemistry was, however, hampered by several factors. The most serious problem was the vast range of material available and the consequent difficulty of organizing it into some system. In addition, there were social and intellectual difficulties, chemistry is nothing if not practical; those who practice it must use their hands, they must have a certain practical flair. Yet in many ancient civilizations, practical tasks were primarily the province of a slave population. The thinker or philosopher stood apart from this mundane world, where the practical arts appeared to lack any intellectual content or interest. The final problem for early chemical science was the element of secrecy. Experts in specific trades had developed their own techniques and guarded their knowledge to prevent others from stealing their livelihood. Another factor that contributed to secrecy was the esoteric nature of the knowledge of alchemists, who were trying to transform. base metals into gold or were concerned with the hunt for the elixir that would bestow the blessing of eternal life. In one sense, the second of these was the more serious impediment because the records of the chemical processes that early alchemists had discovered were often written down in symbolic language intelligible to very few or in symbols that were purposely obscure. What is the passage mainly about？

A.The scientific revolution in the seventeenth century.

B.Reasons that chemistry developed slowly as a science.

C.The practical aspects of chemistry.

D.Difficulties of organizing knowledge systematically.

点击查看答案