单选题The first watermill was horizontal and resembled a rudimentary turbine.

单选题It was not long before Skinners, the famous behaviorist, realized the limitations of his psychological research than another psychologist came with his forceful arguments against Skinners' theory. A. realized... when B. had realized... when C. was realizing... then D. would realize... as

单选题Most modern printing inks contain synthetic pigments, binders and solvents as well as ingredients to promote drying.

单选题When he fails his final examination, he is sure of a university place.

单选题There is no other man in history than Thomas Jefferson who {{U}}formulated{{/U}} the ideas of democracy with such fullness, persuasiveness and logic.

单选题I do not advocate building the park near a jetport, which might make people to suffer from defective hearing.

单选题He was completely ________by her tale of hardship.

单选题Sometimes, the messages are conveyed through deliberate, conscious gestures; other times, our bodies talk without our even knowing. A. definite B. intentional C. delicate D. interactive

单选题 Modern industrial society grants little status to old people. In fact, such a society has a system of built-in obsolescence. There is no formal system for continuing our education throughout our life in order to keep up with rapidly changing knowledge. When our education and job skills have grown obsolete, we are treated exactly like those who have never gained an education or job skills and are not encouraged or given the opportunity to begin anew. As a society becomes more highly developed, the overall status of older people diminishes. Improved health technology creates a large pool of old people, who compete for jobs with the young. However, economic technology lowers the demand for workers and creates new jobs for which the skills of the aged are obsolete, forcing older people into retirement. At the same time, young people are being educated in the new technology and are keeping pace with rapid changes in knowledge. Finally, urbanization creates age-segregated neighborhoods. Because the old live on fixed incomes, they must often live in inferior housing. All these factors -- retirement, obsolete knowledge and skills, inferior standards of living -- lower the status of the aged in society. A century ago, when one could expect to live only to 50 or so, the life span more or less coincided with the occupation and family cycle. But today the average life span allows for fifteen to twenty years of life after these cycles. It appears that our life span is outpacing our usefulness in society.

单选题During the ______ of the rain, she returned home immediately.

单选题China's judicial procedure attaches great importance to the protection of juveniles' legal rights and interests, {{U}}to which{{/U}} there are many important laws containing special provisions. A. on which B. in which C. among which D. along which

单选题The Earth ______ three principal layers: the dense, iron-rich core, the mantle made of silicate rocks, and the thin, solid-surface crust.

单选题While some international couriers are showing signs of exhaustion, EMS (Express Mail Service), the generic name for the courier services of post offices, seems to be finding its stride . Known as Datapost in Britain, as Chronopost in France, and as A1-Barid al-Mumtaz in Saudi Arabia, EMS is now second in the international courier business (jointly with TNT Skypack). Last year it delivered 5.6 million items, weighing less than 20 kilograms each, across borders. That and its annual growth rate of around 5 percent have worried DHL, the market leader, enough for it to counter-attack in the Courts. On October 26, a Dutch judge ruled against DHL on all three counts filed against the Dutch post office: that the three-initial name was too close to DHL"s; that the orange lines in the EMS logo were too similar to DHL"s dark red ones; and that the claim to the widest route system in the world was unfounded. DHL has threatened the Swiss post office with similar action, but it may reconsider after the Dutch ruling. EMS has some advantages over the private couriers. One is a dense ready-made network of offices, especially in Europe, the avowed target area of the private couriers. Another advantage is a long tradition of working with customs authorities. In a business where minutes count, it pays to have good friends at customs. That advantage particularly irritates the private couriers because there is no legal way to combat such unquantifiable coziness. The private courier services are also annoyed because in countries like Switzerland and Italy, where the post office is officially a monopoly, they pay it a fee. In Switzerland DHL says it pays more than SFr lm ($ 708,000) "to the competition" each year. In France the couriers have won a battle for exoneration. Although governments are under little pressure to keep prices artificially low, EMS is often cheaper than the private couriers, but not always. A recent test in Britain (on a domestic route) showed Datapost about halfway between the least and the most expensive, but gave it full marks for speed and service. Each national EMS is free to set its rates and follow its own rules on things like bulk discounts. The Universal Postal Union, based in Berne, determines how costs and revenues are split between sending and receiving countries, and standardizes procedures. More than 100 postal administrations have linked into the system—and more are coming, including Russia"s. That makes the feisty EMS particularly happy since its rivals have not been allowed to serve anywhere in Russia.

单选题Human beings are superior to animals that they can use language as a tool of communication.

单选题A man has to make ______ for his old age by putting aside enough money to live on when old. A. supply B. assurance C. provision D. storage

单选题The guest turned upside down his glass as a signal that he would drink no more.

单选题Many photographers prefer to take pictures at twilight when they can take advantage of the special effects of the setting sun.

单选题Few people realize how rich that area is. It is a land of treasure ______ treasure. A. piled on B. derived from C. turned over D. increased by

单选题Most of that professor"s writings are either for the bird or a hodgepodge of thoughts and ideas coppied from other authors.

单选题While the delegate clearly sought to dampen the optimism that has emerged recently, she stopped short of suggesting that the conference was near collapse and might produce nothing of significance.