题目内容
A．Let the computer to rest.B．Save power.C．Save time for re-launch.D．Leave projects in
查看答案
搜索结果不匹配？点我反馈
更多问题
Part A
Directions: You will hear a talk. As you listen, answer Questions 1-10 by circling TRUE or FALSE. You will hear the talk ONLY ONCE. You now have 1 minute to read Questions 1-10.
听力原文： Hello, everyone. Today I will introduce you the learning chains in Britain. Here the chains refer to schools linked together as part of a group. They can offer students many practical advantages.
When people are asked to name a language school, more often than not, they think of one of the large international chains of schools. Some are vast language teaching organizations with schools in many different countries and may teach just one language.
One of the main strengths of these chains is the fact that their name is familiar to people all over the world. This can be a big advantage in the confusing world of language learning. Most students are bewildered by me large choice of schools and courses on offer, both at home and abroad, and so many prefer to choose a school which has a familiar name and an established reputation. Chain schools know this, and part of their success is due to effective marketing and advertising, which helps to keep their name well-known.
But chain schools should not be dismissed by serious students just because they use clever marketing techniques. They have other important strengthens which can provide advantages to students. A school is only as good as its teachers and facilities, and many chains offer very high standards in both. More chains require that their teachers have internationally recognized qualifications and a maximum amount of teaching experience. It is important for chains to maintain these standards at all schools, because the reputation of the whole chain can be affected if one school performs badly.
Students also benefit from the standardized structure of chains. Most chains use the same text books in all their schools, and often they produce their own coursework materials. They also organize their courses in me same way which means that starting dates and course lengths are usually the same at all schools.
For students, one of the main advantages of this standardized structure is simplicity. If you cannot decide whether to study in the U. S. or Britain, for example, most chains allow students to start their language course at one school and continue at another, so they can experience different regions or different countries, as part of the same study trip.
Chain schools tend to be larger than single center schools, which can also have advantages for students. With larger numbers of students, school administrators can achieve a better mixture of nationalities in classrooms. This means that students can avoid being with other students who speak their language. This gives them the chance to meet students from other countries, and to practice their English with them.
Some chains offer students a very simple booking and enrolment procedure which is also useful. Application forms and enrolment procedures are the same for all schools, so students need only supply their details once.
Students may find that they can book their course abroad through a representative of a chain school in their own town or city. Other chains offer a centralized booking facility, so students only have to contact one center to make a booking anywhere in the world.
Chain schools often operate in different locations, whereas a single school is likely to be based permanently in one building. Many chain schools operate temporary schools, particularly during the summer holidays. In Britain, they often use secondary school premises which are empty during the school holidays.
Studying English in an English-speaking country is the most effective way to learn the language, but for many students this is only one stage of their learning career. Most students start learning
A．Because it's shining.B．Because it's rare.C．Because it's expensive.D．Because it came
Natural gas Vehicles
Kermit the Frog once said, "It's not that easy bein' green." Although he wasn't referring to cars, his observation seems particularly appropriate for the auto industry today: Designing, developing and marketing "green" ears has not been an easy task, which is why gasoline powered vehicles still rule the road and fossil fuels still account for almost 75 percent of the world's energy consumption. As gasoline prices soar and concern over harmful emission mounts, however, cars that run on alternate fuel sources will become increasingly important. A natural-gas vehicle, or NGV, is the perfect example of such a car--it's fuel-efficient, environmentally friendly and offers a relatively low cost of ownership.
Natural Gas Basics
The word "gas" is a confusing term because it is used to describe many different substances that are similar but not exactly the same. For example, the "gas" you put in your car is gasoline, one component of crude oil, or petroleum. Petroleum is a dark, sticky liquid mixture of compounds formed underground by the decay of ancient marine animals.
Natural gas also comes from the decay of ancient organisms, but it naturally takes a gaseous form. instead of a liquid form. Natural gas commonly occurs in association with crude oil. It is derived from both land plants and aquatic (水生的) organic matter and forms above or below oil deposits. It is often dissolved in crude oil at the high pressures existing in a reservoir. There are also reservoirs of natural gas, known as non-associated gas, that contain only gas and no oil.
Natural gas consists primarily of methane (沼气) and other hydrocarbon gases. Hydrocarbons are organic compounds composed only of the elements carbon and hydrogen. The hydrocarbons in natural gas are called saturated hydrocarbons because they contain hydrogen and carbon bound together by single bonds.
Like gasoline, natural gas is combustible (易燃的), which means it can be used in a combustion engine like gasoline. But cars that could burn natural gas didn't appear on the scene until the 1930s.
From Field to Ford
We extract natural gas trapped in underground reservoirs by drilling wells into the earth. A modern well, equipped with diamond-studded drill bits, can drill to depths approaching 25,000 feet.
Throughout the 19th century, the use of natural gas remained localized because there was no way to transport large quantities of gas over long distances. In 1890, the invention of a leak proof pipeline coupling made it possible to transport gas miles from the source. Improvements in pipeline technology continued over the next two decades until long-distance gas transmission became practical. From 1927 to 1931, laborers constructed more than 10 major natural gas transmission systems in the United States, making natural gas a viable energy source for many applications. The oil shortages of the late 1960s and early 1970s brought renewed interest in natural gas as a fuel source, especially for automobiles.
Today, owners of natural-gas vehicles can fill up their cars at one of 1, 300 fueling stations located in the United States. Honda also offers a personal natural gas pump to people who purchase its natural-gas-powered Civic. The pump uses a home's existing natural gas lines and can be installed for ＄500 to ＄1500.
Natural-gas Vehicle Design
Natural-gas vehicles use the same basic principles as gasoline-powered vehicles. In other words, the fuel (natural gas in this case) is mixed with air in the cylinder of a four-stroke engine and then ignited by a spark plug to move a piston (活塞) up and down. Although there are some differences between natural gas and gasoline in terms of flammability and ignition temperatures. NGVs themselves operate on the same fundamental concepts as gasoline-powered vehicles. Still, some modifications
The company exported the first Beetle to USA in
微信支付 
支付宝支付