单选题Smoke particles and other air pollutants are often trapped in the atmosphere, thus forming dirty fog.

单选题Standard English is the variety of English which is usually used in print and which is normally taught in schools and to non-native speakers learning the language. It is also the variety which is normally 21 by educated people and used in news broadcasts and other 22 situations. The difference between standard and non-standard, it should be noted, has 23 in principle to do with differences between formal and colloquial 24 ; standard English has colloquial as well as formal variants. 25 , the standard variety of English is based on the London 26 of English that developed after the Norman Conquest resulted in the removal of the Court from Winchester to London. This dialect became the one 27 by the educated, and it was developed and promoted 28 a model, or norm, for wider and wider segments of society. It was also the 29 that was carried overseas, but not one unaffected by such export. Today, 30 English is arranged to the extent that the grammar and vocabulary of English are 31 the same everywhere in the world where English is used; 32 among local standards is really quite minor, 33 the Singapore, South Africa, and Irish varieties are really very 34 different from one another so far as grammar and vocabulary are 35 . Indeed, Standard English is so powerful that it exerts a tremendous 36 on all local varieties, to the extent that many of long-established dialects of England have 37 much of their vigor and there is considerable pressure on them to be 38 . This latter situation is not unique 39 English: it is also true in other countries where processes of standardization are 40 . But it sometimes creates problems for speakers who try to strike some kind of compromise between local norms and national, even supranational (跨国的) ones.

单选题The implication in this passage is that ______

单选题Once you have developed a good study habit, try to keep it______.

单选题The student asked her professor if he would have gone on the space ship {{U}}he did know{{/U}} earlier.

单选题At last John Smith chose to step down as the company's chief executive and return to his roots in software research.

单选题The Polynesians, who colonized Hawaii sometime between A． D． 500 and A． D． 1000, found uses for many {{U}}indigenous{{/U}} plants.

单选题Table tennis is easy to learn, and, {{U}}by the same token{{/U}}, boys don't need a lot of space to practice it.

单选题People whose property {{U}}is stolen{{/U}} should report to the police.

单选题 The "Karat" marking on jewelry tells you what proportion of gold is mixed with other metals, ff 14 parts of gold are mixed with 10 parts of base metal, the combination is called 14-Karat (14K) gold. The higher the Karat rating, the higher the proportion of gold in the object. The lowest Karat gold that can be marketed in the United States is 10-Karat gold. Jewelry does not have to be marked with its Karat quality, but most of it is. ff there is a Karat quality mark, next to it must be the U.S. registered trademark of the person or company that will stand behind the mark, as required by the National Gold and Silver Stamping Act.

单选题In spite of ill health and a physical Udisability/U that threatened her career, Carson McCullers completed a novel in the summer of 1961 that made the best-seller list.

单选题If you had been more careful in typing the report, you______to do it over again.

单选题But if you allow me to be frank, it's the people, especially, the younger generation that I'm ______.

单选题Sam, an university student, invented a new medical instrument.

单选题Celebrate. Celebrate. Physicians are delighted with a Food and Drug Administration (FDA) advisory panel"s recommendation earlier this year that Vioxx and its cousins Bextra and Celebrex (all medicines known as Cox-2 inhibitors) should remain on the market , despite evidence they increase heart disease risk in some people. The panelists reached their decision after weighing all the data and concluding the benefits of these pain-relieving drugs outweighed the risks. Specifically, these scientists acknowledged that, for some patients, these prescription drugs were uniquely effective in reducing pain from arthritis and other causes. For others—concerned about ulcers associated with aspirin and other OTC analgesics—the Cox-2 inhibitors offered the advantage of minimizing potentially serious effects of stomach irritation. Now is an appropriate time for everyone to take a fresh look at the benefit-risk equation for Vioxx and the other Cox-2 inhibitors. The risks, increased risk of heart disease in some who use the drugs—have been well publicized. Much less publicity has been given to a spectrum of real and potential benefits that go way beyond reduced risk of stomach irritation. These little—discussed benefits would have been lost, perhaps permanently—had Vioxx, Bextra and Celebrex been driven from shelves in pursuit of perfect safety, an unattainable goal. For example, there is substantial evidence Cox-2 inhibitors can reduce development of colon polyps, which may become colon cancer indeed. Celebrex is FDA-approved for those genetically prone to colon cancer. Ironically, the 2004 study that revealed the elevated heart attack risk of Vioxx was primarily designed to further establish the drug"s effectiveness in protecting against colon cancer. And while the results of that interrupted trial have not yet been published, there is good reason to believe they will confirm the protective effects against colon cancer established in research over the last 10 years. At the time of its withdrawal from the market last fall, studies of Vioxx as well as the other Cox-2 drugs suggest that they had other anti-cancer properties as well, possibly reducing the risk of malignancies of a number of sites, including the lung and esophagus. Had these drugs been dismissed, their untapped promise for prevention would have evaporated well before it was evaluated and applied to save lives. Fortunately, cooler and wiser heads prevailed.

单选题I was ______ in my reading, and didn't at first hear the doorbell ring.

单选题Some people believe that" King John" was written by Shakespeare, but some people think it might be written by an ______ author. A. delivered B. anonymous C. antique D. ambiguous

单选题They teach the vocabulary of the English used in computer science, which is also listed ______ in the glossary.

单选题On the slope of Long's Peak in Colorado that lies the ruin of a gigantic tree.

单选题It is simple enough to say that since books have classes -- fiction, biography, poetry -- we should separate them and take from each what it is right and what should give us. Yet few people ask from books what can give us. Most commonly we come to books with blurred and divided minds, asking of fiction that it shall be true, of poetry that it shall be false, of biography that it shall be flattering, of history that it shall enforce our own prejudices. If we could banish all such preconception when we read, that would be an admirable beginning. Do not dictate to your author; try to become him. Be his fellow-worker and accomplice. If you hang back, and reserve and criticize at first, you are preventing yourself from getting the fullest possible value from what you read. But if you open your mind as widely as possible, then signs and hints of almost imperceptible fineness, from the twist and turn of the first sentences, will bring you into the presence of a human being unlike any other. Steep yourself in this, acquaint yourself with this, and soon you will find that your author is giving you, or attempting to give you, something far more definite. The 32 chapters of a novel -- if we consider how to read a novel first -- are an attempt to make something as formed and controlled as a building: but words are more impalpable than bricks; reading is a longer and more complicated process than seeing. Perhaps the quickest way to understand the elements of what a novelist is doing is not to read, but to write; to make your own experiment with the dangers and difficulties of words. Recall, then, some event that has left a distinct impression on you -- how at the comer of the street, perhaps, you passed two people talking. A tree shock; an electric light danced; the tone of the talk was comic, but also tragic; a whole vision, an entire conception, seemed contained in that moment. But when you attempt to reconstruct it in words, you will find that it breaks into a thousand conflicting impressions. Some must be subdued; others emphasized; in the process you will lose, probably, all grasp upon the emotion itself. Then turn from your blurred and littered pages to the opening pages of some great novelist -- Defoe, Jane Austen, Hardy. Now you will be better able to appreciate their mastery. It is not merely that we are in the presence of a different person -- Defoe, Jane Austen, or Thomas Hardy -- but that we are living in a different world. Here, in Robinson Crusoe, we are trudging a plain high road; one thing happens after another; the fact and the order of the fact is enough. But if the open air and adventure mean everything to Defoe, they mean nothing to Jane Austen. Here is the drawing-room, and people talking, and by the many mirrors of their talk revealing their characters. And if, when we have accustomed ourselves to the drawing-room and its reflections, we turn to Hardy, we are once more spun around. The moors are round us and the stars are above our heads. The other side of the mind is now exposed -- the dark side that comes uppermost in solitude, not the light side that shows in company. Our relations are not towards people, but towards Nature and destiny. Yet different as these worlds are, each is consistent with itself. The maker of each is careful to observe the laws of his own perspective, and however great a strain they may put upon, they will never confuse us, as lesser writers so frequently do, by introducing two different kinds of reality into the same book. Thus to go from one great novelist to another -- from Jane Austen to Hardy, from Peacock to Trollope, from Scott to Meredith -- is to be wrenched and uprooted; to be thrown this way and then that. To read a novel is a difficult and complex art. You must be capable not only of great fineness of perception, but of great boldness of imagination if you are going to make use of all that the novelist -- the great artist -- gives you.