单选题How men first learned to invent words is unknown; in other words, the origin of language is a mystery. All we really know is that men, unlike animals, invented certain sounds to express thoughts and feelings, actions and things, so that they could communicate with each other, and later they agreed on certain signs. These signs were called letters, which could be combined to represent those sounds and could be written down. Those sounds, whether spoken or written in letters, are called words. The power of words, then, exists in their associations—the things they bring up before our minds. Words become filled with meaning for us by experience, and the longer we live, the more certain words remind us of the glad and sad events of our past, and the more we read and learn, the more number of words increases. Great writers are those who not only have great thoughts but also express these thoughts in words which deeply attract our minds and emotions. This skillful use of words is called "literary style". Above all, a real poet can express his meaning in words which sing like music and can move men to tears. We should, therefore, learn to choose our words carefully and use them properly, or they will make our speech silly and vulgar.

单选题It's all annual back-to-school routine. One morning you wave goodbye, and that (56) evening you're burning the late-night oil in sympathy. In the race to improve educational standards, (57) are throwing the books at kids. (58) elementary school students are complaining of homework (59) . What's a well-meaning parent to do? As hard as (60) may be, sit back and chill, experts advise. Though you've got to get them to do it, (61) helping too much, or even examining (62) too carefully, you may keep them (63) doing it by themselves. "I wouldn't advise a parent to check every (64) assignment," says psychologist John Rosemond, author of Ending the Tough Homework. "There's a (65) of appreciation for trial and error. Let your children (66) the grade they deserve. " Many experts believe parents should gently look over the work of younger children and ask them to rethink their (67) . But "you don't want them to feel it has to be (68) ," she says. That's not to say parents should (69) homework first, they should monitor how much homework their kids (70) . Thirty minutes a day in the early elementary years and an hour in (71) four, five, and six is standard, says Rosemond. For junior-high students it should be " (72) more than an hour and a half," and two for high school students. If your child (73) has more homework than this, you may want to check (74) other parents and then talk to the teacher about (75) assignments.

单选题A: Would you mind checking my spelling and punctuation in this literature here, please? B: ______

单选题Beijing is becoming ______ and ______. A) beautiful, beautiful B) more, more beautiful C) more beautiful, more beautiful D) more beautiful, more

单选题Guest. I've booked a double room for 3 nights under Fowler. Receptionist : ______ A. Good afternoon, how can I help you? B. Are you taken care of, sir? C. Can you spell it for me? D. May I have your name?

单选题A. gravityB. valuableC. dangerousD. companion

单选题He had more dictionaries than ______ for his work. A. they are needed B. it was needed C. were necessary D. necessary were they

单选题 A. {{U}}o{{/U}}fficial B. {{U}}o{{/U}}bserve C. {{U}}o{{/U}}bey D. {{U}}o{{/U}}bviously

单选题Historically, the spread, prevalence, and very existence of contagious disease have wholly depended on the growth and concentration of human populations.【R1】______And though the last century has witnessed substantial worldwide success in combating many past scourges—such as polio and smallpox—infectious diseases still claim more lives than any other group of diseases. The prevailing demographic trends continue to create a crowded human " medium" that both invites and is vulnerable to infection. The share of humanity living in cities with more than 1 million people has surged from less than 5 percent in 1900 to nearly 40 percent today, creating the ideal setting for the resurgence of old infectious diseases as well as the development of new ones.【R2】______ Overcrowding—the increased proximity of susceptible individuals—is a principal risk factor for the incidence and spread of all major infectious diseases, including tuberculosis, dengue fever, malaria, and acute respiratory illnesses, which are unable to spread and survive in low population densities.【R3】______ Aside from sheer growth and increasing density, the urbanization under way in developing nations is often accompanied by deteriorating health indicators and increased exposure to disease risk factors. Access to clean water, good hygiene, and adequate housing are sorely lacking in developing nations. As a result, waterborne infections such as cholera and other diarrheal diseases account for 90 percent of all infectious diseases in developing countries—and 40 percent of all deaths in some nations.【R4】______ In both industrial and developing nations, incidences of a wide range of infectious diseases, including tuberculosis, diarrheal diseases, and HIV/AIDS, are considerably higher in urban slums— where poverty and compromised health define the way of life—than in the rest of the city.【R5】______A. Key disease carriers, such as insects and rats, thrive in crowded urban settings, further facilitating spread.B. The unprecedented population densities in fourteenth-century Europe, for example, led to the plague outbreak that claimed the lives of one fourth of the population.C. Although these infections are easily preventable if adequate water and sanitation are available, the vast majority of the world's population is lifelong victims.D. While new global markets have created unprecedented economic opportunities and growth, the health risks of our increasingly interconnected and fast-paced world continue to grow.E. Pathogens can more readily establish in large populations, since all infectious diseases require a critical number of vulnerable individuals in order to take root and spread.F. These areas can serve as a perpetual reservoir of disease or disease vectors, placing other parts of the city at risk of an outbreak and allowing the disease to continue evolving, often into a deadlier strain.

单选题Today we make room for a remarkably narrow range of personality styles. We're told that to be great is to be bold, to be happy is to be sociable. We see ourselves as a nation of extroverts — which means that we've lost sight of who we really are. One-third to one-half of Americans are introverts — in the other words, one out of every two or three people you know. If you're not an introvert yourself, you are surely raising, managing, married to, or coupled with one. If these statistics surprise you, that's probably because so many people pretend to be extroverts. Closet introverts pass undetected on playgrounds, in high school locker rooms, and in the corridors of corporate America. Some fool even themselves, until some life event — a layoff, an empty nest, an inheritance that frees them to spend time as they like — jolts them into taking stock of their true natures. You have only to raise this subject with your friends and acquaintances to find that the most unlikely people consider themselves introverts. It makes sense that so many introverts hide even from themselves. We live with a value system that I call the Extrovert Ideal — the omnipresent belief that the ideal self is gregarious, alpha, and comfortable in the spotlight. The archetypal extrovert prefers action to contemplation, risk-taking to heed-taking, certainty to doubt. He favors quick decisions, even at the risk of being wrong. She works well in teams and socializes in groups. We like to think that we value individuality, but all too often we admire one type of individual — the kind who's comfortable "putting himself out there. " Sure, we allow technologically gifted loners who launch companies in garages to have any personality they please, but they are the exceptions, not the rule, and our tolerance extends mainly to those who get fabulously wealthy or hold the promise of doing so. Introversion — along with its cousins' sensitivity, seriousness, and shyness — is now a second-class personality trait, somewhere between a disappointment and a pathology. Introverts living under the Extrovert Ideal are like women in a man's world, discounted because of a trait that goes to the core of who they are. Extroversion is an enormously appealing personality style, but we've turned it into an oppressive standard to which most of us feel we must conform. The Extrovert Ideal has been documented in many studies, though this research has never been grouped under a single name. Talkative people, for example, are rated as smarter, better-looking, more interesting, and more desirable as friends. Velocity of speech counts as well as volume: we rank fast talkers as more competent and likable than slow ones. Even the word introvert is stigmatized — one informal study, by psychologist Laurie Helgoe, found that introverts described their own physical appearance in vivid language, but when asked to describe generic introverts they drew a bland and distasteful picture. But we make a grave mistake to embrace the Extrovert Ideal so unthinkingly. Some of our greatest ideas, art, and inventions — from the theory of evolution to van Gogh's sunflowers to the personal computer — came from quiet and cerebral people who knew how to tune in to their inner worlds and the treasures to be found there.

单选题In every cultivated language there are two great classes of words which, taken together, comprises the whole vocabulary. First, there are those words 21 which we become acquainted in daily conversation, which we 22 , that is to say, from the 23 of our own family and from our familiar associates, and 24 we should know and use 25 we could not read or write. They 26 the common things of life, and are the stock in trade of all who 27 the language. Such words may be called "popular", since they belong to the people 28 and are not the exclusive 29 of a limited class. On the other hand, our language 30 a multitude of words which are comparatively 31 used in ordinary conversation. Their meanings are known to every educated person, but there is little 32 to use them at home or in the market-place. Our 33 acquaintance with them comes not from our mother"s 34 or from the talk of our school-mates, 35 from books that we read, lectures that we 36 , or the more 37 conversation of highly educated speakers who are discussing some particular 38 in style appropriately elevated above the habitual 39 of everyday life. Such words are called "learned", and the 40 between them and the "popular" words is of great importance to a right understanding of linguistic process.

单选题We regret ______ you that the goods you ordered are out of stock.

单选题Many college graduates choose to work in ______ area to change the backward condition there.

单选题It was not until he came back ______ he knew the police were looking for him．A．whichB．sinceC．thatD．before

单选题Kate: Do you mind opening the door for me?Bob:______A. Yes, I'll do it.B. It' s nothing.C. That' s all right.D. Not at all.

单选题3 Certainly no creature in the sea is odder than the common sea cucumber. All living creatures, especially human beings, have their peculiarities, but everything about the little sea cucumber seems unusual. What else can be said about a bizarre animal that" among other eccentricities, eats mud, feeds almost continuously day and night but can live with- out eating for long periods, and can be poisonous but is considered supremely edible by gourmets? For some fifty million years, despite all its eccentricities, the sea cucumber has sub- sisted on its diet of mud. It is adaptable enough to live attached to rocks by its tube feet, under rocks in shallow water, or on the surface of mud flats. Common in cool water on both Atlantic and Pacific shores, it has the ability to suck up mud or sand and digest whatever nutrients are present. Sea cucumbers come in a variety of colors, ranging from black to reddish-brown to sand-colored and nearly white. One form even has vivid purple tentacles. Usually the crea- tures are cucumber-shaped--hence their name and because they are typically rock inhabitants, this shape, combined with their flexibility, enables them to squeeze into crevices where they are safe from predators and ocean currents. Although they have voracious appetites, eating day and night, sea cucumbers have the capacity to become quiescent and live at a low metabolic rate--feeding sparingly or not at all for long periods, so that the marine organisms that provide their food have a chance to multiply. If it were not for this faculty, they would devour all the food available in a short time and would probably starve themselves out of existence. But the most spectacular thing about the sea cucumber is the way it defends itself. Its major enemies are fish and crabs. When attacked, it squirts all its internal organs into the water. It also casts off attached structures such as tentacles. The sea cucumber will eviscerate and regenerate itself if it is attacked or even touched: it will do the same if the surrounding water temperature is too high or the water becomes too polluted.

单选题I'm going away for a ______.