单选题It"s evident that her handling of them has bruised the peaches.

单选题Some species of bacteria and fungi {{U}}thrive on{{/U}} simple compounds such as alcohol.

单选题 下面有3篇短文，每篇短文后有5道题，每道题后面有4个选项。{{B}}第一篇{{/B}} {{B}}Clobal Cancer Rates to Rise 50% by 2020{{/B}} The number of new cancer cases worldwide is expected to increase by 50% by the year 2020. But a new report suggests that as many as a third of new cancers could be avoided by adopting healthier lifestyles and through public health action. The World Cancer Report, released by the International Agency for Research on Cancer (IARC, part of the World Health Organization), shows that cancer has now emerged as a major public health threat in developing countries as well as affluent ones. Overall, cancer was responsible for 12% of all heaths in 2000. But in many countries more than a quarter of all deaths are caused by cancer. The report shows that 10 million new cancers were diagnosed globally in 2000, and that number is expected to rise to 15 million by 2020. Researchers say most of that increase will mainly be due to steadily aging populations in both developed and developing countries and current trends in smoking and other unhealthy habits. "Cancer has emerged as a major public health problem in developing countries for the first time, matching its effect in industrialized countries," says researcher Paul Kleihues, MD, director of IARA, in a news release. "Once considered a 'Western' disease, the Report highlights that more than 50 percent of the world's cancer burden, in terms of both numbers of cases and deaths, already occurs in developing countries." The risk of being diagnosed with cancer in developed countries is double that in less-developed ones. However, the risk of dying from cancer is much higher in developing countries, where 80% of cancer patients already have late-stage incurable tumors at the time of diagnosis. Researchers say cancer rates have traditionally been higher in developed countries due to greater exposure to tobacco, occupational carcinogens, and an unhealthy Western diet and lifestyle. As less-developed countries become industrialized and more prosperous, they tend to adopt the high-fat diet and low physical activity levels typically seen in the West, which increase cancer rates.

单选题In previous times, when fresh meat was inadequate , pigeons were kept by many households as a source of food.

单选题Because of Oden's uniqueness, he is always performing in the spotlight and subject to public scrutiny. A. ridicule B. censorship C. examination D. criticism

单选题The other, more publicly acceptable form of geo-engineering would focus on removing carbon from the atmosphere and storing it underground. Known as carbon capture and storage (CCS), this idea is behind today's experimental clean-power plants, which are attracting lots of research and funding. But clean, coal plants will only reduce future emissions, which does not address the root of the problem. Among all the uncertainties that still surround climate change, one thing has become clear: the scary durability of carbon, which will hang in the air for a thousand years, continuing to warm the planet no matter how drastically future emissions are cut. So there is a growing urgency behind the geo-engineer's dream: to change the climate by artificial means, either sucking the existing carbon out of the air or cooling the air with solar reflectors. Why is carbon so scary according to the passage?A. It will contihue to warm the globe for many years.B. It cannot be easily captured and stored.C. Its emission will increase in the coming years.D. It cannot be reflected back into the spac

单选题I am not certain whether he will come.

单选题Certainly we need law or else society will deteriorate to provide survival, but it doesn't create Ucooperation/U.

单选题They have the capability to destroy the enemy in a few days.

单选题"You want me to send in three men to dig the box up, without making a sound, and Uget rid of/U it properly?"

单选题 Trees 1. Trees are plants that survive year after year and have a single main stem composed entirely of wood. Some kinds grow to only ten feet. Others attain heights of more than 350 feet. These giants also have stems that are as much as 100 feet in circumference (圆周). 2. Over 25,000 different species of tree grow around the wood, except near the North and South Poles. They all belong to one of two possible groups. They are either coniferous (松类的) or deciduous (落叶的). Coniferous trees are evergreens (常绿的), such as pine or fir, which bear needlelike foliage (叶子) all year long. Many deciduous trees have broad leaves, which they usually shed each year at the beginning of the cold season. 3. Trees provide people with a host of oils, drugs, glues, candy, cloths, fuels, and well over 10,000 wooden products. Some have unique qualities that make their wood valuable for special purposes. One particular type of tree, for example, is used to make fishing rods because it is not strong but unusually flexible. Queensland walnut is used by the electrical industry in Australia, because it is almost as good an electrical insulator as rubber. One of the world most unusual trees is the teak (柚木). It is one of the heaviest of all woods, and it has the largest leaves of any tree. These enormous leaves are two feet square and their surface is so tough and coarse that cabinetmakers in India use them as sandpaper. Teakwood itself is so heavy that when a teak tree is first cut down it will not float in water. It takes three years for the ten or fifteen-ton trunk to dry out enough so it will not sink. 4. Of all the world's billions of living trees, the tallest is a giant redwood in California. It towers 368 feet. This redwood tree is anchored and nourished by a massive root system. It extends over three full acres.

单选题Early United States Reinterpreted by Bernard Bailyn Bernard Bailyn has recently reinterpreted the early history of the United States by applying new social research findings on the experiences of European migrants. In his reinterpretation, migration becomes the organizing principle for rewriting the history of preindustrial North America. His approach rests on four separate propositions. The first of these asserts that residents of early modern England moved regularly about their countryside; migrating to the New World was simply a natural spillover. Although at first the colonies held little positive attraction for the English—they would rather have stayed home—by the eighteenth century people increasingly migrated to America because they regarded it as the land of opportunity. Secondly, Bailyn holds that, contrary to the notion that used to flourish in America history textbooks, there was never a typical New World community. For example, the economic and demographic character of early New England towns varied considerably. Bailyn"s third proposition suggests two general patterns prevailing among the many thousands of migrants: one group came as indentured servants, another came to acquire land. Surprisingly, Bailyn suggests that those who recruited indentured servants were the driving forces of transatlantic migration. These colonial entrepreneurs helped determine the social character of people who came to preindustrial North America. At first, thousands of unskilled laborers were recruited; by the 1730"s, however, American employers demanded skilled artisans. Finally, Bailyn argues that the colonies were a half-civilized hinterland of the European culture system. He is undoubtedly correct to insist that the colonies were part of an Anglo-American empire. But to divide the empire into English core and colonial periphery, as Bailyn does, devalues the achievements of colonial culture. It is true, as Bailyn claims, that high culture in the colonies never matched that in England. But what of seventeenth-century New England, where the settlers created effective laws, built a distinguished university, and published books? Bailyn might respond that New England was exceptional. However, the ideas and institutions developed by New England Puritans had powerful effects on North American culture. Although Bailyn goes on to apply his approach to some thousands of indentured servants who migrated just prior to the revolution, he fails to link their experience with the political development of the United States. Evidence presented in his work suggests how we might make such a connection. These indentured servants were treated as slaves for the period during which they had sold their time to American employers. It is not surprising that as soon as they served their time they passed up good wages in the cities and headed west to ensure their personal independence by acquiring land. Thus, it is in the west that a peculiarly American political culture began, among colonists who were suspicious of authority and intensely anti-aristocratic.

单选题The contract between the two companies will {{U}}expire{{/U}} soon. A. shorten B. end C. start D. resume

单选题The staff of the company are always {{U}}courteous{{/U}} and helpful.

单选题Writing is a skill that requires {{U}}consistent {{/U}}practice.

单选题 Obtaining Drinking Water from Air Humidity Not a plant to be seen, the desert ground is too dry. But the air contains water, and research scientists have found a {{U}} {{U}} 1 {{/U}} {{/U}}of obtaining drinking water from air humidity. The system is based completely on renewable energy and is therefore autonomous. Cracks permeate the dried-out desert ground and the landscape bears testimony to the lack of water. But even here, where there are no lakes, rivers or groundwater, considerable quantities of water are stored in the air. In the Negev desert in Israel, for example, annual average relative air humidity is 64 percent-in every cubic meter of air there are 11.5 milliliters of water. German research scientists have found a way of converting this air humidity autonomously into drinkable water. "The process we have developed is based exclusively on renewable energy sources {{U}} {{U}} 2 {{/U}} {{/U}}thermal solar collectors and photovoltaic ceils, {{U}} {{U}} 3 {{/U}} {{/U}}makes this method completely energy-autonomous. It will {{U}} {{U}} 4 {{/U}} {{/U}}function in regions where there is no electrical infrastructure." says Siegfried Egner, head of the research team. The principle of the {{U}} {{U}} 5 {{/U}} {{/U}}is as follows: hygroscopic brine-saline solution which absorbs moistureruns down a tower-shaped unit and absorbs water from the air. It is then sucked {{U}} {{U}} 6 {{/U}} {{/U}}a tank a few meters off the ground in which a vacuum prevails. Energy from solar collectors {{U}} {{U}} 7 {{/U}} {{/U}}up the brine, which his diluted by the water it has {{U}} {{U}} 8 {{/U}} {{/U}}. Because of the vacuum, the boiling point of the liquid is lower than it would be under {{U}} {{U}} 9 {{/U}} {{/U}}atmospheric pressure. This effect is known from the mountains: as the atmospheric pressure there is lower than in the valley, water boils at temperatures distinctly below 100℃. The evaporated, non-saline water is condensed and runs down through a completely filled tube in a controlled manner. The gravity of this water column {{U}} {{U}} 10 {{/U}} {{/U}}produces the vacuum and so a vacuum pump is not needed. The reconcentrated brine {{U}} {{U}} 11 {{/U}} {{/U}}down the tower surface again to absorb moisture from the air. "The concept is suitable for various water {{U}} {{U}} 12 {{/U}} {{/U}}. Single-person units and plants supplying water to entire hotels are conceivable, " says Egner. Prototypes have been built for {{U}} {{U}} 13 {{/U}} {{/U}}system components-air moisture absorption and vacuum evaporation-and the research scientists have already {{U}} {{U}} 14 {{/U}} {{/U}}their interplay on a laboratory scale. In a further {{U}} {{U}} 15 {{/U}} {{/U}}the researchers intend to develop a demonstration facility.

单选题We're happy to collaborate with you in the project. A. compete B. cooperate C. coordinate D. contend

单选题From my standpoint, this thing is just ridiculous A. field B. point of view C. knowledge D. information

单选题What is the writer’s attitude to robots in the future?

单选题His claims seem Ucredible/U to many people.