单选题I think the charge for overloaded luggage is excessive in ______ to its size.

单选题Among the factors affecting a lesson plan, which of the following is human factor?

单选题______ all our kindness to help her, Sara refused to listen. A. At B. In C. For D. On

单选题Human population growth is a {{U}}menace{{/U}} to nonhuman life forms on our planet.

单选题Whitening the world's roofs would offset the emissions of the world's cars for 20 years, according to a new study from Lawrence Berkeley National Laboratory. Overall, installing lighter-colored roofs and pavements can cancel the heat effect of two years of global carbon dioxide emissions, Berkeley Lab says. It's the first roof-cooling study to use a global model to examine the issue. Lightening up roofs and pavement can offset 57 billion metric tons of carbon dioxide, about double the amount the world emitted in 2006, the study found. It was published in the journal Environmental Research Letters. Researchers used a conservative estimate of increased albedo, or solar reflection, suggesting that purely white roofs would be even better. They increased the albedo of all roof by 0. 25 and pavement by 0. 15. That means a black roof, which has an albedo of zero, would only need to be replaced by a roof of a cooler color — which might be more feasible to implement than a snowy white roof. Berkeley Lab says. The researchers extrapolated a roof's CO 2 offset over its average lifespan. If all roofs were converted to white or cool colors, they would offset about 24 gigatons (24 billion metric tons) of CO 2 , but only once. But assuming roofs last about 20 years, the researchers came up with 1. 2 gigatons per year. That equates to offsetting the emissions of roughly 300 million cars, all the in the world, for 20 years. Pavements and roofs cover 50 to 65 percent of urban areas and cause a heat-island effect because they absorb so much heat. That's why cities are significantly warmer than surrounding rural areas. This effect makes it harder—and therefore more expensive — to keep buildings cool in the summer. Winds also move the heat into the atmosphere, causing a regional warming effect. Energy secretary Steven Chu, a Nobel Laureate in physics (and former Berkeley Lab director), has advocated white roofs for years. He put his words into actions by directing all Energy Department offices to install white roofs. All newly installed roofs will be white, and black roofs might be replaced when it is cost-effective over the lifetime of the roof. "Cool roofs are one of the quickest and lowest-cost ways we can reduce our global carbon emissions and begin the hard work of slowing climate change. " He said in a statement.

单选题Now let us look at how we read. When we read a printed text, our eyes move across a page in short, jerky movement. We recognize words usually when our eyes are still when they fixate. Each time they fixate, we see a group of words. This is known as the recognition span or the visual span. The length of time of which the eyes stop —the duration of the fixation----varies considerably from person to person. It also varies within any one person according to his purpose in reading and his familiarity with the text. Furthermore, it can be affected by such factors as lighting and tiredness. Unfortunately, in the past, many reading improvement courses have concentrated too much on how our eyes move across the printed page. As a result of this misleading emphasis on the purely visual aspects of reading, numerous exercises have been devised to train the eyes to see more words at one fixation. For instance, in some exercises, words are flashed on to a screen for, say, a tenth or a twentieth of a second. One of the exercises has required students to fix their eyes on some central point, taking in the words on either side. Such word patterns are often constructed in the shape of rather steep pyramids so the reader takes in more and more words at each successive fixation. All these exercises are very clever, but it' s one thing to improve a person' s ability to see words and quite another thing to improve his ability to read a text efficiendy. Reading requires the ability to understand the relationship between words. Consequently, for these reasons, many experts have now begun to question the usefulness of eye training, especially since any approach which trains a person to read isolated words and phrases would seem unlikely to help him in reading a continuous text.

单选题 Aristotle was one of those who could found a civilization, and while he thought of education as both a social value and an end in itself, he ascribed its chief importance{{U}} (21) {{/U}}what might be considered a third basic concept of education: to train the mind to think,{{U}} (22) {{/U}}what it is thinking about. The key is not{{U}} (23) {{/U}}it knows but how it{{U}} (24) {{/U}}any new fact or argument. "An educated man," Aristotle wrote in On the Parts of Animals, "should be able to{{U}} (25) {{/U}}a fair offhand judgment as to the goodness or badness of the method used by a professor in his exposition. To be{{U}} (26) {{/U}}is in fact to be able to do this." The Aristotle view of education as a{{U}} (27) {{/U}}has become the conventionally worthy answer today{{U}} (28) {{/U}}college presidents and other academic leaders are asked what an education should be. An educated man, says Harvard President Bok,{{U}} (29) {{/U}}a deep breath, must have a "curiosity in{{U}} (30) {{/U}}the unfamiliar and unexpected, an open-mindedness in entertaining opposing points of view,{{U}} (31) {{/U}}for the ambiguity that surrounds so many important issues, and a willingness to make the best decision he can in the fact of uncertainty and doubt." This is an approach that appears to{{U}} (32) {{/U}}more importance to the process of learning{{U}} (33) {{/U}}to the substance of what is learned. The very old notion of the generalist who could comprehend all subjects has{{U}} (34) {{/U}}been an impossibility. To make matters{{U}} (35) {{/U}}more difficult, the fields of knowledge keep changing.

单选题It is implied in the text that the parents' change can be attributed to

单选题I didnt ______ to take a taxi but I had to as I was late. A) assume B) suppose C) mean D) hope

单选题Despite all the refinements of subtlety and the dogmatism of learning, it is by the common sense and compassion of readers that are uncorrupted by the prejudices of some opinionated scholars ______ the characters and situations in medieval and Elizabethan literature, as in any other literature, can best be judged. A. that B. which C. what D. ×

单选题Some people don't openly admit they have ambition because ______.

单选题During the 1700s and 1800s, major fighting during wars generally ceased for the winters and armies took up winter encampments. As winter descended upon Pennsylvania in 1777, General George Washington chose Valley Forge, Pennsylvania, some eighteen miles west of Philadelphia as site of the winter encampment of the Continental Army. The area was far enough away from the British in Philadelphia to discourage surprise attacks and its location between high hills and the Schuylkill River made it easily defensible. The Continental Army, however, was in bad shape. Of the 12,000 soldiers, many lacked the supplies or clothing to Survive the winter and many others were starving at this point. At Valley Forge, defense lines were built along with over 1,000 huts to provide some relief from the brutal elements. Moisture from rain and melting snow made it impossible for many soldiers to stay dry and allowed for the spread of disease. The only reliable food that the soldiers received was a mixture of flour and water known as "firecake". Occasionally, soldiers received meat and bread. Furthermore, many soldiers had inadequate supplies of clothing and were forced to endure the winter in tatters and without blankets. Many lacked shoes. Wounded soldiers often died from exposure to the elements. Unsanitary and crowded conditions led to the proliferation of diseases and sicknesses such as typhoid and pneumonia. Over 2,000 people died from such sicknesses. On February 23,1778, former German General Baron yon Steuben arrived at Valley Forge to train the Patriots how to march in formation, fire guns quickly, use bayonets and become soldiers. Though von Steuben spoke little English, he developed a training manual in French that would be translated on the grounds into English. Unlike many American generals, von Steuben worked directly with the soldiers, endearing him to the thousands suffering at Valley Forge. Von Steuben"s presence did much to improve the morale of the army during the bitter winter and also helped them develop into a more tactical, effective military machine, capable of fighting the British. On June 19,1778, the Continental Army left Valley Forge in pursuit of the British who were moving north to New York.

单选题—Nancy's grades are really bad. —Yes, but Tom's are ______.

单选题{{B}}Directions:{{/B}} For each blank in the following passage, choose the best answer from the choices given below. Mark your answer on the Answer Sheet by drawing with a pencil a short bar across the corresponding letter in the brackets. Recruiting(招募) the right candidate to fill a vacancy can be a difficult and costly task.{{U}} (31) {{/U}}the wrong person could be an expensive mistake which could cause personal problems for the whole department. And, as every HR(Human Resource) manager knows, it is much more difficult to get rid of someone than it is to{{U}} (32) {{/U}}them. The HR manager's first decision is{{U}} (33) {{/U}}to recruit internal applicants or advertise the vacancy outside the company.{{U}} (34) {{/U}}applicants are easy to recruit by memo, e-mail, or newsletter. Furthermore, they are easy to assess and know the company well.{{U}} (35) {{/U}}, they rarely bring fresh ideas to a position. More- over, a rejected internal candidate might become unhappy and leave the company. Recruiting outside the company means either advertising the vacancy directly or{{U}} (36) {{/U}}an employment agency. If the company decides to advertise the vacancy directly, it has to decide where to place the{{U}} (37) {{/U}}. Traditionally this has meant newspapers and professional journals but now the Intemet is also very popular. The decision normally depends on the vacancy. Companies advertise blue-collar or clerical jobs in local news- papers and senior management{{U}} (38) {{/U}}in national papers or professional journals,{{U}} (39) {{/U}}the Intemet is one of the best ways of advertising IT vacancies or recruiting abroad. However, with the Internet is a risk{{U}} (40) {{/U}}receiving unsuitable applications from all over the world.

单选题It was not until December 31______we heard from him.

单选题He didn't notice me in the erowd; but he spotted my sister who was ______ because of her red hair. A. conscious B. conspicuous C. dim D. conscientious

单选题The Chinese women' s volleyball team won the World Cup victory, which was beyond our wildest______.

单选题The passage suggests that a large decrease in the amount of CO2 in the atmosphere would result in ______.