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Almost all metals are good conductors, silver______ the best of all.
A．is
B．being
C．has been
D．is to be
答案
更多“Almost all metals are good conductors, silver______ the best of all.A．isB．beingC．has beenD”相关的问题
第1题
Recycling
One of the most important changes in how modern societies respond to the problems of waste and its disposal is the development of techniques and processes for recycling materials that have been thrown away. Of course, recycling means that the material was cycled before. What the word really means is that the material has gone from a raw material to a factory or production process to use by a consumer. Most plastics, for example, began as crude oil from oil wells. A manufacturing process changes some of the chemicals in oil to plastics. The plastics are made into thousands of products and sent on to consumers who use them. When consumers are finished with their plastic bottles or toys or packages, they throw them away.
Unfortunately, as we often see on automobile bumper stickers, "Throw it away？ There is no away." What that means, of course, is that as we produce more and more waste, safe and easy places to put it are be coming fewer and fewer. Moreover, oil for plastics, trees for paper, and coal and oil to make heat for glass and metal production are also becoming harder to find and more expensive. One solution that can help solve problems of both supply and disposal is recycling, or using the same material more than once.
As an idea, recycling has been around for a long time. In fact, we might say that it has always been around, as long as people have used something after it has been used for something else. Using a coconut shell as a container after the coconut has been eaten may have occurred long ago. Glass jars are used to store screws or nails in many homes. Many industries have reused materials. Steel mills have added old steel to their furnaces, and glass companies have done the same with old glass. Paper has also been reused. In recent years, however, recycling is being seen as a more and more important way to reduce waste and the use of raw materials.
Many cities in the United States have begun recycling programs for household waste. Household waste, or the trash and garbage that we throw away from our homes, is made up mostly of paper. Food is the second largest part, but glass and metal are the next largest. Together, paper, glass, and metal make up almost 75 percent of the trash we throw away. If we could recycle much of that, we could greatly reduce the amount of trash we have to find a place for.
Some governments are also requiring more recycling. Japan already recycles about 50 percent of its household trash. The German government now has a very strict law requiring that most plastics and metal be recycled. This law has made a big change in the way automobiles are built and sold. Under the new law, automobile manufacturers must buy a car back when it is no longer useful. The car must then be separated into materials that can be recycled—metals, plastics, glass, and so on. This law has made automobile manufacturers think more carefully about the kinds of materials that go into automobiles and how those materials are used.
Recycling does not always go smoothly. Sometimes industries are not able to use all of the old material that is available.If paper manufacturers cannot use all of the old paper that is available, there will be no one to buy it and it will still have to be thrown away. The same is true for many metals and plastics. In Germany, problems have developed with their new law, because more materials are being recovered than manufacturers of new items can use. The government has to buy these materials, and it is costing a lot of money.
Closely related to the problem of usability is the problem of cost of recovery. There are many types of plastics, and not all of them can be reused or reused together. They have to be separated, cleaned, and sorted. Automobiles are made up of many types of metals and plastics. Separating all of these materials and recovering them for re
A．Y
B．N
C．NG
第2题
根据文章内容进行判断，正确写“T”错误写“F”。
Beads, stones, seashells, paper, precious metals such as gold and silver, base metals such as iron have all been used as money. Today, money is printed on paper. A lot of countries use their own currency, with names such as dollar, pound, franc, ruble, Yuan and so on. Since 2002, 18 of the EU members have replaced their national currencies by Euro notes and coins.
If you want to pay for something in another currency, you have to change your money into the other money. If you want to travel outside your native country,you need to change your own country's money for the money of the country you are visiting. Most large banks sell foreign currencies. You can exchange money at a bank or at an office of a tourist agency.
Wherever you go, exchanging money puts you in touch with international finance, which is concerned with exchange rates between different currencies. Deciding the rate for the international exchange of money is one of the most complex aspects of international banking.
()26. This best title for this passage is “The history of money”
()27. Euro is available in all EU member countries.
()28. Foreign exchange rates have significant impact on the economy of a country.
()29. Currency means money in the form. of paper.
()30. Banks are a good option to get your money exchanged.
第3题
Few realize that this Antarctic continent is almost equal in size to South America, and enormous field of work awaits geographers and prospectors. The coasts of this continent remain to be accurately charted, and the mapping of the whole of the interior presents a formidable task to the cartographers who undertake the work. Once their labors are completed, it will be possible to prospect the vast natural resources which scientists believe will furnish one of the largest treasure hoards of metals and minerals the world has yet known, and almost inexhaustible sources of copper, coal, uranium, and many other ores will become available to man. Such discoveries will usher in an era of practical exploitation of the Antarctic wastes.
The polar darkness which hides this continent for the six winter months will be defeated by huge batteries of light which make possible the establishing of air-fields for the future inter- continental air services by making these areas as light as day. Present flying routes will be completely changed, for the Antarctic refueling bases will make flights from Australia to South America comparatively easy over the 5,000 miles journey.
The climate is not likely to offer an insuperable problem, for the explorer Admiral Byrd has shown that the climate is possible even for men completely untrained for expeditions into those frozen wastes. Some of his parties were men who had never seen snow before, and yet he records that they survived the rigors of the Antarctic climate comfortably, so that, provided that the appropriate installations are made, we may assume that human beings from all countries could live there safely. Byrd even affirms that it is probably the most healthy climate in the world, for the intense cold of thousands of years has sterilized this continent, and rendered it absolutely germfree, with the consequences that ordinary and extraordinary sickness and diseases from which man suffers in other zones with different climates are here utterly unknown. There exist no problems of conservation and preservation of food supplies, for the latter keep indefinitely without any signs of deterioration; it may even be that later generations will come to regard the Antarctic as the natural storehouse for the whole world.
Plans are already on foot to set up permanent bases on the shores of this continent, and what so few years ago was regarded as a "dead continent" now promises to be a most active center of human life and endeavor.
When did man begin to explore the Antarctic？ ______
A．About 100 years ago.
B．In 20th century.
C．At the beginning of the 19th century.
D．In 1798.
第4题
W: Oh, please be serious! I suppose they will change shapes as well. If you want a big car to take all your friends camping, I suppose you'll just be able to snap your fingers and make it happen. Or if you want a sporty two-seater, you could just tell the car what you wanted, and it would do the rest. Is that how it will work？
M: No, I am serious. They have found a way to alter the surface of metals so that they can reflect different colors just by passing a small amount of electricity over them.
W: Oh, I see. So anything that touches the outside of the car will get a shock. That sounds lovely.
M: It's only a tiny amount of electricity. It wouldn't be enough to shock anybody.
W: Well, it sounds pretty difficult to believe.
M: Yes, it's quite amazing. The important thing you have to remember is that the color of an object is really just an illusion created by the way light bounces off its surface. Engineers have been able to produce a car that changes colors at the touch of a button by slightly rearranging the position of the particles on the surface of the metal.
W: It sounds so amazing. But I guess it could be possible.
M: It is possible today. The only problem is that it is very expensive. To produce a car with a surface that changed colors would cost almost twice as much as what a regular car costs. For that much money you could just by the car and have it repainted twenty times, so it's not very practical yet.
W: Yes, but in other ways it could be more practical. If you took your car to be painted twenty times, it would use quite a bit of polluting chemicals, and it would take a long time.
M: You're right there, but how many people really get their car repainted that many time？
W: Hmm, I suppose you're right, but I sure would love to have my car match my outfit every day.
(26)
A．She is impressed.
B．She is doubtful.
C．She is shocked.
D．She is surprised.
第5题
Examples of automobiles, rockets and submarines are used to show that .
A．humans are the most clever living creatures in the world
B．human inventions enable us to travel in almost any kind of environment
C．humans are very successful in inventing transportation tools
D．humans can’t move like other animals in any circumstances
第6题
Now almost all the students have a monthly ______ towards their expenses.
A．salary
B．allowance
C．wage
D．fee
第7题
As it was almost time for the flight, all the passengers got______the plane.
A．around
B．abroad
C．aboard
D．ahead
第8题
I guess Jones didn't have a chance to win the election. ____ the people in the city voted for his opponent.
A) Most all of B) Most of all C) Almost all of D) Almost the whole of
第9题
Turner almost ______ that he hadn't told him that bad news, but all was too late.
A．wished
B．hoped
C．believed
D．realized
第10题
