单选题Neither of us ______ the experience of studying abroad.

单选题He is mentioned in the chapter and also in ______that proceeds.

单选题The new staff didn"t know how to use the system ______ I explained it to him yesterday.

单选题I have been instructed by my agent that you owe me five dollars.A) 我被我的代理告知你还欠我五美元。B) 我的代理指导我应该偿还你五美元。C) 我的上级告诉我你还欠我五美元。D) 我的上级指导我说我应该尽快偿还你五美元。

单选题The representative of the company demanded that part of the agreement ______ revised.

单选题A man cannot be really happy if what he enjoys doing is ignored by society as of no importance．

单选题He didn't know ______ to express her ideas in English clearly in public. A. which C. why B. what D. how

单选题The United Nations, an accepted authority on population levels and trends, estimates that the world population reached 5.3 billion in 1990, and is increasing annually by more than 90 million persons. The rate of increase, 1.7 percent per year, has fallen below the peak rate of 2 percent per year attained by 1970. However, absolute yearly increments are not expected to start declining until after the year 2000. Estimates of world population before 1900 are based on fragmentary (不全的；不完整的) data, but scholars agree that average population growth approached approximately 0.002 percent per year. Growth was delayed and influenced by climate, food supply, disease, and war. Starting in the 17th century, great advances in scientific knowledge, agriculture, industry, medicine, and social organization made possible substantial increases in population. Inanimate (无生命的) energy gradually replaced human and animal labor. People slowly acquired the knowledge and means to control disease. All continents shared in a five-time population increase over a 300-year period--from about 500 million in 1650 to 2.5 billion in 1950--but increases were most obvious in regions where new technologies were devised and applied. Beginning about 1950, with improvements in water supplies, sewage (下水道里的污物) -disposal facilities, and transportation networks, agricultural yields increased, and deaths from infectious and parasitic diseases greatly declined. Life expectancy at birth in most developing countries increased from about 35-40 years in 1950 to 61 years by 1990.

单选题In the meantime, the question facing business is whether such research is ______ the costs.A) worthyB) worth ofC) worthD) worthwhile

单选题No modestly educated adult can fail to be upset by such an experience.A) 没有略受教育的成年人会为这样的经历难过。B) 略受教育的成年人没有谁不会为这样的经历难过。C) 略受教育的成年人都不会为这样的经历难过。D) 不是所有受过教育的成年人都会为这样的经历难过。

单选题The article gives us a good advice about how to evaluate your child's work at home. That is

单选题Airline companies are responsible for transporting your luggage. If you cannot recover it at the point of arrival, you must inform the airline immediately. They will carry out the necessary search, if the luggage is recovered, it will be delivered to your place of residence. If you wish to insure your luggage, you may do so at your own expense.

单选题The footsteps ______ his return.

单选题Goods sold at lower prices are not necessarily popular items.

单选题We can not be too careful in performing operation. A. 我们做手术越仔细越好。 B. 我们做手术时不能太仔细。 C. 我们手术试验达不到太仔细的程度。 D. 我们做手术时不得不很仔细。

单选题The meaning of "BANNED" in "SMOKING SHOULD BE BANNED AROUND CHILDREN" is ______.

单选题 For the past few weeks, we have been discussing national energy conservation alternatives for the future. Today I'm going to talk about what one community is presently doing to conserve (保存) energy. The people of Davis, California, have succeeded in cutting their energy consumption by 1/3 since 1973. The first energy saving action that was taken in the early 70's was the legislation (立法) of street building codes. All new houses in Davis must have the proper insulation (绝缘) so that heat will not escape unnecessarily during the winter. New houses must also face north or south, so that they will not be overheated by the sun in summer. The law has definitely had an effect. Since 1976, there has been a 50 percent saving in the amount of natural gas and electricity used in healing and air conditioning. There are other energy saving features about Davis. Buses partially supported by the city transport university students throughout the area. There are 24 miles of bicycle paths, and today there are twice as many bicycles as cars in the city. By reducing the available parking space, the city council has succeeded in reducing the number of cars in the city every day. Another benefit of the reduced parking is the greater number of small cars. People are saving gas because they are choosing not to drive, or because they are driving fuel-economic car. Davis, California has become an energy saving model for other cities. Time is up for today. Next week, we'll return to our regular topic of national energy alternatives.

单选题Jack said it had been foolish______me to make such a mistake.A) ofB) forC) toD) with

单选题[此试题无题干]

单选题There was one thought that air pollution affected only the area immediately around large cities with factories and heavy automobile traffic. At present, we realize that although these are the areas with the worst air pollution, the problem is literally worldwide. On several occasions over the past decade, a heavy cloud of air pollution has covered the east of the United States and brought health warnings in rural areas away from any major concentration of manufacturing and automobile traffic. In fact, the very climate of the entire earth may be infected by air pollution. Some scientists consider that the increasing concentration of carbon dioxide in the air resulting from the burning of fossil fuels (coal and oil) is creating a "greenhouse effect"—conserving heat reflected from the earth and raising the world"s average temperature. If this view is correct and the world"s temperature is raised only a few degrees, much of the polar ice cap will melt and cities such as New York, Boston, Miami, and New Orleans will be in water. Another view, less widely held, is that increasing particular matter in the atmosphere is blocking sunlight and lowering the earth"s temperature—a result that would be equally disastrous. A drop of just a few degrees could create something close to a new ice age, and would make agriculture difficult or impossible in many of our top farming areas. Today we do not know for sure that either of these conditions will happen (though one recent government report drafted by experts in the field concluded that the greenhouse effect is very possible). Perhaps, if we are lucky enough, the two tendencies wilt offset each other and the world"s temperature will stay about the same as it is now. Driven by economic profits, people neglect the damage on our environment caused by the "advanced civilization". Maybe the air pollution is the price the human beings have to pay for their development. But is it really worthwhile?