单选题It is seldom {{U}}acceptable{{/U}} to abbreviate words in formal writing.

单选题United States Navy Admiral Alfred Mahan wrote many books on naval strategy and sea power.

单选题Most babies can {{U}}take in{{/U}} a wide range of food easily. A. bring B. keep C. serve D. digest

单选题It"s almost 5 o"clock, time to quit .

单选题If you are Usmart/U, you'd buy now before prices go up.

单选题It"s sensible to start any exercise program gradually at first.

单选题The research team needs to Uconfer/U with the director before it begins its final report.

单选题The term "composition" refers to the way the components of a drawing are arranged by the artist.

单选题下面有3篇短文，每篇短文后有5道题。请根据短文内容，为每题定1个最佳选项。{{B}}第一篇{{/B}} American Immigrants The percentage of immigrants (including those unlawfully present ) in the United states has been creeping upward for years. At 12.6 percent, it is now higher than at any point since the mid 1920s. We are not about to go back to the days when congress openly worried about inferior races polluting America's bloodstream. But once again we are wondering whether we have too many of the wrong sort newcomers. Their loudest critics argue that the new wave of immigrants cannot, and indeed do not want to, fit in as previous generations did. We now know that these racist views were wrong. In time, Italians, Romanians-and members of other so-called inferior races became exemplary Americans and contributed greatly, in ways too numerous to detail, to the building of this magnificent nation. There is no reason why these new immigrants should not have the same success. Although children of Mexican immigrants do better, in terms of educational and professional attainment, than their parents, UCLA sociologist Edward Telles has found that the gains don't continue. Indeed, the fourth generation is marginally worse off than the third. James Jackson, of the University of Michigan, has found a similar trend among black Caribbean immigrants. Telles fears that Mexican-Americans may be fated to follow in the footsteps of American blacks-that large parts of the community may become mired(陷入) in a seemingly permanent state of poverty and underachievement. Like African-Americans, Mexican-Americans are increasingly relegated to (降入)segregated substandard schools, and their dropout rate is the highest for any ethnic group in the country. We have learned much about the foolish idea of excluding people on the presumption of the ethnic/racial inferiority. But what we have not yet learned is how to make the process of Americanization work for all. I am not talking about requiring people to learn English or to adopt American ways; those things happen pretty much on their own, but as arguments about immigration hear up the campaign trail, we also ought to ask some broader question about assimilation, about how to ensure that people, once outsiders, don't forever remain marginalized within these shores. That is a much larger question than what should happen with undocumented workers, or how best to secure the border, and it is one that affects not only newcomers but groups that have been here for generations. It will have more impact on our future than where we decide to set the admissions bar for the latest ware of would-be Americans. And it would be nice if we finally got the answer right.

单选题The second part of the Internet is the" pipes" that carry data, video, e-mail messages, and text from companies such as Google, Hulu, Yahoo !, and Twitter, the millions of websites that make up Internet content and services, to customers. Some of these" pipe" providers, specifically telecom and cable companies, are already complaining that the amount of data that they have to move is rising too rapidly for them to accommodate. Video files, which are particularly large, have posed significant problems to cable companies and they have asked Washington to be able to charge more for customers who use the Internet to transfer large files. So far, the government has turned those requests down. All the following are mentioned as part of the "pipes" EXCEPTA. e-mail messages.B. video.C. text from companies.D. cable companies.

单选题The policeman wrote down all the {{U}}particulars {{/U}}of the accident

单选题Public lands can be used for energy development when

单选题Scientists Make Sweet Discovering Good news for chocoholics: the treat preferred by millions all over the world is good for you, according to American researchers at the University of California. Chocolate contains substances called flavonoids that can help maintain a healthy heart and good circulation. The researchers have discovered that cocoa acts like aspirin and that eating a bar of chocolate has also been shown to release endorphins in the body: these chemicals help to reduce pain and stress and make you feel happy. The Olmec Indians of Mexico and Central America were the first to grow cocoa beans, in about1500 BC, and the Mayas were drinking unsweetened coca hundreds of years before it became fashionable in Europe. In 1544, a delegation of Mayan nobles visited Philip of Spain and gave him jars of cocpa as a gift. Cocoa soon became fashionable in Spain and Portugal. The Spanish were the first to add sugar to their cocoa drink. By the middle of the century, solid chocolate was becoming familiar. In 1765, James Baker and John Hanan opened the first chocolate mill in the United States, introducing chocolate to the average citizen. In 1896, in Switzerland, Daniel Peter had the idea of adding milk in the chocolate-making process and produced the first milk chocolate. Since then, chocolate has grown enormously in popularity. One of the biggest chocolate-eating nations is Britain where the average man, women, and child eats nine kilos of chocolate a year. In fact, chocolate is the number one comfort food and there are more chocoholics in Britain than any where else in the world. Researchers warn that although chocolate is good for you, it should be eaten in small quantities and with no added milk.

单选题When I heard the noise in the next room, I couldn’t resist having a (peep) look.A. chance B. visit C. look D. try

单选题We have never seen such gorgeous hills.

单选题What does Moravec think of these future robots?

单选题The economy continued to exhibit signs of decline in September.

单选题 Green Roof Research The concept of green roofs is basically about growing plants on roofs, thus helping to replace the green footprint that had been destroyed due to the construction of the building. Green roofs are the most prevalent (流行) in Germany, which is widely regarded as the leader in green roof research. The green roofs that are used these days can be classified as "extensive" and "intensive" systems. Extensive green roofs use mosses, grasses and herbs, which are tolerant to droughts. These plants do not need much maintenance, can be grown in a layer of substrate (土层) that can be as shallow as 1.5 inches, and generally are inaccessible to the public. In contrast, a wide range of species of plants are grown on intensive green roofs, such as shrubs (灌木) and even trees, which require deeper substrate layers, and are usually grown on flat roofs. They need intensive maintenance, and are usually areas that resemble parks which are accessible to people. There are several benefits of adopting green roof technologies. Apart from the obvious psychological and aesthetic (审美学的) benefits of garden—like environments surrounding you, some of the common economic and ecological benefits are: a reduction in the consumption of energy; air and water purification; recovering green spaces; and the mitigation (缓解) of the heat island effect in urban areas. The green roof research that is currently ongoing is focused on evaluating the species of plants that are suitable to be grown on roofs, the methods of propagation (繁殖) as well as establishment, nutrient (养料) and water requirement, substrates, and the quantity and quality of water runoff. The evaluation criteria of plant species are: at what rate they can be established their capacity to withstand invasive weeds; tolerance of cold and heat; tolerance of drought conditions; capacity of persistence and survival. A number of experiments are being conducted on roof platform simulations at various research centers. These sites are generally outfitted with equipment, which are used to measure temperatures at different depths of the growing substrates, and the rate and volume of the runoff of stormwaters from each of the platforms. Green roof technology is representative of a completely new market for landscape contractors, and all roofs that currently exist and the future ones to be constructed are the potential market—a market that is too huge to be overlooked.

单选题We have got to abide by the rules.

单选题Nowadays nearly everyone has suffered from a bad attack of forgetfulness when a password is needed. The company computer, the home computer, banking and ATM machines, Websites, car and home security systems. The list goes on. It does not take long to accumulate a dozen or more passwords. Scribbling them down on slips of paper or simply using the same password for anything and everything is how most people cope with the overload. The negative aspect of this is that either way makes it easier for hackers to invade computer privacy. Using the same password for everything may result inA. the user's forgetfulness.B. the user's overload.C. the loss of banking accounts.D. the theft of privacy.