单选题"I always get confused about tipping in this country." "Usually you __ to leave 15 percent for a waiter or waitress. Taxi drivers expect 10 or 15 percent, too."

单选题Methanol-fueled vehicles would __ an immediate lessening of urban air pollution.

单选题China’s 11th __ plan __ great emphasis on the environment.

单选题Not until the year of 1962 __ made the capital of this country.

单选题__ brings us together is __ we have common interests which transcend those differences.

单选题The instructions are too clear on the bottle: These tablets __ they are able to make about twenty different sounds.

单选题This room needs ______.

单选题Charles is my all-weather friend. When I honestly need his___, he is on my side.

单选题My grandfather has decided to make me go back to college immediately, study my lessons carefully, and. __

单选题Though in New York, Peter had always preferred to record the plain facts of small town life.

单选题“Could I borrow your bike?” “Yes, you_________”.

单选题The CEO needs an assistant that he can __ to take care of problems in his absence.

单选题If I were the president of a university 1 should __ a compulsory course in "How to Use Your Eyes".

单选题_______ WAP technology, people can do their work anywhere anytime.

单选题America's early __ were attracted by the fertile land and varied climates it offered for farming.

单选题A complete refining installation must include all necessary__.

单选题The costs may be so high that no company will ______ the work,

B级： The diffusion of knowledge is the dominant trend of our time. What was happening in Britain duringthe lndustriai Revolution was not an isolated phenomenon. A succession of visitors to Britain would go backfo their countries to report on the technological innovations they saw there. Sometimes societies were able tolearn extremely fast, as in the United States. Others, like Italy, benefited from starting kate, leapfrogging thelong-drawn out process that Britain went through. This diffusion of knowledge accelerated dramatically in recent years. Over the last 30 years we havewatched countries like Japan, Singapore and now China grow at a pace that is four times that of Britain at thepeak of the Industrial Revolution. They have been able to do this because of their energies, of course, butalso because they cleverly adopted certain ideas about development that had worked in the West--relativelyfree markets, open trade, a focus on science and technology, among them. And this shift is happening allaround the world. From Thailand to South Afl-ica, from Brazil to Mexico, countries are far better managedecommfically than they have ever been.

The chemical industry depends very heavily on petroleum and natural gas as sources of raw materials. It is likely that in excess of 80% of the literally thousands of different basic organic chemicals employed today are derived from these sources. The petrochemical industry has grown with the petroleum industry. As is the case with the latest trends in changing crude oil types, it must also evolve to meet changing technological and humanitarian needs. The manufacture of chemicals from petroleum and natural gas constituents is an excellent example of the conversion of such materials to more valuable products. The individual chemicals made from petroleum and natural gas numerous and include industrial chemicals, household chemicals and paints, as well as intermediates for the manufacture of products, such as synthetic rubber and plastics. The processing of petroleum hydrocarbon to yield materials that are, essentially, the building blocks of other chemicals industries, is now very extensive. The classification of materials such as petrochemicals is used to indicate the source of the chemical compounds, but it should be remembered that many common petrochemicals can be made form other sources, and the terminology is therefore a matter of source identification., Petrochemicals are generally chemical compounds derived from petroleum either by direct manufacture or by indirect manufacture as by-products from the variety of processes that are used during the refining of petroleum. Gasoline, fuel oils, lubricating oils, waxes, asphalts, and the like are excluded from the definition of petrochemicals, since they are not, in the true sense, chemical compounds but are in fact intimate mixtures of hydrocarbons. B级 The chemical industry depends very heavily on petroleum and natural gas as sources of raw materials. It is likely that in excess of 80% of the literally thousands of different basic organic chemicals employed today are derived from these sources. The petrochemical industry has grown with the petroleum industry. As is the case with the latest trends in changing crude oil types, it must also evolve to meet changing technological and humanitarian needs. The manufacture of chemicals from petroleum and natural gas constituents is an excellent example of the conversion of such materials to more valuable products. The individual chemicals made from petroleum and natural gas numerous and include industrial chemicals, household chemicals and paints, as well as intermediates for the manufacture of products, such as synthetic rubber and plastics. The processing of petroleum hydrocarbon to yield materials that are, essentially, the building blocks of other chemicals industries, is now very extensive.

A 级 China is about to adopt its llth five-year plan, setting the stage for the continuation of probablythe most remarkable economic transformation in recent years, while improving the well-being ofalmost a quarter of the world's population. While much of the rest of the developing world has been directed at a common quest for higherGDP, China has once again made clear that it seeks sustainable increases in the people's happiness. China realizes that it has entered a phase of economic growth that is imposing enormousdemands on the environment. Unless them is a change in course, living standards will eventually becompromised. That is why the new five-year plan places great emphasis on the environment. China recognizes, too, that what separates less developed from more developedcountries is not only a gap in resources, but also a gap in science and technology. So it has laid outnew plans not only to reduce that gap, but to create a basis for independent innovation. China's role in the world and the world's economy has changed, and the plan reflects this, too. Itsfuture economical model will have to be based more on domestic demand than on exports, whichwill require increases in consumption. Strengthening social security and public education willsimultaneously increase citizens' sense of well-being, and promote current consumption. With such a clear vision of the future, the challenge will be implementation. Market econonfiesare not selLregulating. They cannot simply be left on autopilot, especially if one wants to ensurethat their benefits are shared widely. But managing a market economy is a difficult task. It is abalancing act that must constantly respond to economic changes. China's llth five-year planprovides a roadmap for that response.