单选题Indeed, almost every scientist now finds it impossible to read all the works relevant to his own subject, ______ extensively outside of it. A. much more to read B. much less to read C. still more reading D. much less reading

单选题Although Venus is the nearest planet of the Earth, little is known about it because it is ______ covered by thick clouds.

单选题Speaker A: I hear there is a good Japanese restaurant nearby. Would you like to go there for lunch?Speaker B: ______

单选题In the absence of optimism, we are left with nothing but critics, naysayers, and prophets of doom. When a nation expects the worst from its people and institutions, and its experts focus exclusively on faults, hope dies. Too many people spend too much tie looking down rather than up, finding fault with their country's political institutions, economic system, educational establishment, religious organizations, and—worst of all—with each other. Faultfinding expends so much negative energy that nothing is left over for positive action. It takes courage and strength to solve the genuine problems that afflict every society. Sure, there well always be things that need fixing. But the question is, do you want to spend your time and energy tearing things down or building them up? The staging of a Broadway show could illustrate my point. Let's say a new production is about to open. A playwright has polished the script, investor have put up the money, and the theater has been rented. A director has been chosen, actors have been auditioned and selected, and the cast has been rehearsing for weeks. Set, lighting, and sound engineers have been hard at work. By the time opening night arrives, nearly a hundred people have labored tirelessly—all working long hours to make magic for their audience. On opening night, four or five critics sit in the audience. If they pan it, the play will probably close in a matter of days or weeks. If they praise it, the production could go on for a long and successful run. In the end, success or failure might hinge on the opinion of a single person—someone who might be in a bad mood on opening night! What's wrong with this scene? In one sense, nothing. Critics have a legitimate role. The problem arises when we make critics our heroes or put them in control of our fate. When we empower the critic more than the playwright, something is wrong. It is much easier to criticize than to create. When we revere the critics of society, we eventually become a society of critics, and when that happens, there is no room left for constructive optimism.

单选题{{B}}Text 3{{/B}} Success, it is often said, has many fathers--and one of the many fathers of computing, that most successful of industries, was Charles Babbage, a 19th-century British mathematician. Exasperated by errors in the mathematical tables that were widely used as calculation aids at the time, Babbage dreamed of building a mechanical engine that could produce flawless tables automatically. But his attempts to make such a machine in the 1920s failed, and the significance of his work was only rediscovered this century. Next year, at last, the first set of printed tables should emerge from a calculating "difference engine" built to Babbage's design. Babbage will have been vindicated. But the realization of his dream will also underscore the extent to which he was a man born ahead of his time. The effort to prove that Babbage's designs were logically and practically sound began in 1985, when a team of researchers at the Science Museum in London set out to build a difference engine in time for the 200th anniversary of Babbage's birth in 1992. The team, led by the museum's curator of computing, Doron Swade, constructed a monstrous device of bronze, iron and steel. It was 11 feet long, seven feet tall, weighed three tons, cost around $500 000 and took a year to piece together. And it worked perfectly, cranking out successive values of seventh-order polynomial equations to :31 significant figures. But it was incomplete. To save money, an entire section of the machine, the printer, was omitted. To Babbage, the printer was a vital part of design. Even if the engine produced the correct answers, there was still the risk that a transcription or typesetting error would result in the finished mathematical tables being inaccurate. The only way to guarantee error-free tables was to automate the printing process as well. So his plans included specifications for a printer almost as complicated as the calculating engine itself, with adjustable margins, two separate fonts, and the ability to print in two, three or four columns. In January, after years of searching for a sponsor for the printer, the Science Museum announced that a backer had been found. Nathan Myhrvold, the chief technology officer at Microsoft, agreed to pay for its construction (which is expected to cost $373 000 with one Proviso: that the Science Museum team would build him an identical calculating engine and printer to decorate his new home on Lake Washington, near Seattle). Construction of the printer will begin--in full view of the public--at the Science Museum later this month. The full machine will be completed next year. It is a nice irony that Babbage's plans should be realized only thanks to an infusion of cash from a man who got rich in the computer revolution that Babbage helped to foment. More striking still, even using 20th-century manufacturing technology the engine will have cost over $830 000 to build. Allowing for inflation, this is roughly a third of what it might have cost to build in Babbage's day-in contrast to the cost of electronic-computer technology, which halves in price every 18 months. That suggests that, even had Babbage succeeded, a Victorian computer revolution based on mechanical technology would not necessarily have followed.

单选题{{B}}Directions:{{/B}}Read the following text. Choose the best word(s) for each numbered blank and mark A, B, C or D on ANSWER SHEET 1. The fact that blind people can "see" things using other parts of their bodies apart from their eyes may help us to understand our feelings about color. If they can{{U}} (1) {{/U}}color differences, then perhaps we, too, are affected by{{U}} (2) {{/U}}unconsciously. Manufacturers have discovered by{{U}} (3) {{/U}}that sugar sells badly in green wrappings,{{U}} (4) {{/U}}blue foods are considered unpleasant, and the cosmetics should never be packaged{{U}} (5) {{/U}}brown. These discoveries have grown{{U}} (6) {{/U}}a whole discipline of color psychology that now finds{{U}} (7) {{/U}}in everything from fashion to interior decoration. Some of our{{U}} (8) {{/U}}are clearly psychological. Dark blue is the color of the night sky and{{U}} (9) {{/U}}associated with passivity and calm, while yellow is a day color with{{U}} (10) {{/U}}of energy and incentive. For primitive man, activity during the day{{U}} (11) {{/U}}hunting and attacking, while he soon saw as red, the color of blood and rage and the heat that came{{U}} (12) {{/U}}effort. And green is associated with passive{{U}} (13) {{/U}}and self preservation. Experiments have{{U}} (14) {{/U}}that green, partly bemuse of its physiological associations, also has a direct psychological{{U}} (15) {{/U}}, it is a calming color.{{U}} (16) {{/U}}its exciting connotations, red was chosen as the signal for changer,{{U}} (17) {{/U}}closer analysis shows that a vivid yellow can produce a{{U}} (18) {{/U}}basic state of alertness and (19) , so fire engines and ambulances in some advanced communities are now{{U}} (20) {{/U}}around in bright yellow colors that stop the traffic dead.

单选题Judging from the context, what does the word "them" (Line 4, Paragraph 4) refer to?

单选题Your eye is a window on the nerves and blood vessels, revealing vital information about your entire body. An (1) exam starts from the outside and works in. First the ophthalmologist (眼科医生) gauges (2) with the familiar wall chart and checks visual field by moving objects in and out of (3) . A limited visual field could be the (4) of the high inner eye pressure of glaucoma(青光眼)or (5) a tumor pressing on nerves leading from the eye. The physician also checks for infection around the lashes and notes how fast the lids follow the eyes downward. Lid lag sometimes (6) thyroid disease (甲状腺疾病). If one pupil contracts (7) the other doesn't, the physician is (8) to the fact that (9) a tumor or stroke, perhaps, has damaged the nerves between the eye and brain. A tumor as far away (10) the lung can cause capillary problems by hitting a nerve that loops through the neck. The white of the eye, tear ducts, lens and retina (视网膜) are checked for (11) of trouble. Too many white blood cells (12) inflammation, blood means tissue has tom or a vessel has burst, and deposits of (13) material can mean eye disease. The orange-red retina holds many more (14) for disease detection. High blood pressure may announce its (15) by pushing the vessels off track at their intersections. (16) vessel growth is a sign of diabetic retinopathy (糖尿病性视网膜病). Narrowed vessels may indicate (17) of the arteries, and damage to tiny capillaries could be a sign of early diabetes. The doctor even examines the pin-head-size hole in the back of the optic nerve on their way to the brain. (18) the appearance of these nerve fibers is abnormal, nerve tissue may have been damaged because of intraocular pressure, indicating glaucoma or the presence of a tumor. When a physician needs quick, (19) information about the body, the eyes have (20) .

单选题There has been a growing concern______pollution. But those who concern themselves______this problem need government support.

单选题Mr. Zhang, ______ came to see me yesterday, is an old friend of my father's. A. which B. that C. who D. whom

单选题I sent invitations to 90 people, ______ have replied.A. of whom only 30 of themB. of whom only 30C. only 30 of those whoD. only 30 who

单选题In the decades between 1910 and 1930, over ten percent of the Black population of the United States left the South, where the majority of the Black population had been located, and migrated to northern states, with the largest number moving, it is claimed, between 1916 and 1918. It has been frequently assumed, but not proved, that most of the migrants in what has come to be called the Great Migration came from rural areas and were motivated by two concurrent factors: the collapse of cotton industry following boll-weevil infestation, which began in 1898, and increased demand in the North for labor following the cessation of European immigration caused by the outbreak of the first World War in 1914. This assumption has led to the conclusion that the migrant's subsequent lack of economic mobility in the North is tied to rural background, a background that implies unfamiliarity with urban living and a lack of industrial skills. But the question of who actually left the South has never been investigated in detail. Although numerous investigations document a flight from rural southern areas to southern cities prior to the Great Migration, no one has considered whether the same migrants then moved on to northern cities. In 1910 over 600,000 Black workers, or ten percent of the Black work force reported themselves to be engaged in "manufacturing and mechanical pursuits", the federal census category roughly including the entire industrial sector. The Great Migration could easily have been made up entirely of this group and their families. It is perhaps surprising to argue that an employed population could be tempted to move, but an explanation lies in the labor conditions then prevalent in the South. About thirty-five percent of the urban Black population in the South was engaged in skilled trades. Some were from the old artisan class of slavery—blacksmiths, masons, carpenters—which had a monopoly of certain trades, but they were gradually being pushed out by competition, mechanization, and obsolescence. The remaining sixty-five percent, more recently urbanized, worked in newly developed industries—tobacco, lumber, coal and iron manufacture, and railroads. Wages in the South, however, were low, and Black workers were aware, through labor recruiters and the Black press, that they could earn more even as unskilled workers in the North than they could as artisans in the South. After the boll-weevil infestation, urban Black workers faced competition from the continuing influx of both Black and White rural workers, who were driven to undercut the wages formerly paid for industrial jobs. Thus, a move north would be seen as advantageous to a group that was already urbanized and steadily employed, and the easy conclusion tying their subsequent economic problems in the North to their rural backgrounds comes into question.

单选题It was______ of you to get up to catch the first bus so that you could avoid traffic jam.

单选题I1. He is quite sure that it's ______ impossible for him to fulfill the task within two days.

单选题When it comes to the slowing economy, Ellen Spero isn't biting her nails just yet. But the 47-year-old manicurist isn't cutting, filling or polishing as nails as she'd like to, either. Most of her clients spend $12 to $50 weekly, but last month two longtime customers suddenly stopped showing up. Spero blames the softening economy. "I'm a good economic indicator," she says, "I provide a service that people can do without when they're concerned about saving some dollars." So Spero is downscaling, shopping at middle-brow Dillard's department store near her suburban Cleveland home, instead of Neiman Marcus, "I don't know it other clients are going to abandon me, too." She says. Even before Alan Greenspan's admission that America's red-hot economy is cooling, lots of working folks had already seen signs of the slowdown themselves. From car dealer-ships to Gap outlets, sales have been lagging for months as shoppers temper their spending. For retailers, who last year took in 24 percent of their revenue between Thanksgiving and Christmas, the cautious approach is coming at a crucial time. Already, experts say, holiday sales are off 7 percent from last year's pace. But don't sound any alarms just yet. Consumers seem only mildly concerned, not panicked, and many say they remain optimistic about the economy's long-term prospects, even as they do some modest belt-tightening. Consumers say they're not in despair because, despite the dreadful headlines, their own fortunes still feel pretty good. Home prices are holding steady in most regions. In Manhattan, "there's a new gold rush happening in the $4 million to $10 million range, predominantly fed by Wall Street bonuses." Says broker Barbara Corcoran. In San Francisco, prices are still rising even as frenzied overbidding quiets. "Instead of 20 to 30 offers, now maybe you only get two or three," says John Tealdi, a Bay Area real-estate broker. And most folks still feel pretty comfortable about their ability to find and keep a job. Many folks see silver linings to this slow-down. Potential home buyers would cheer for lower interest rates. Employers wouldn't mind a little fewer buddles in the job market. Many consumers seem to have been influenced by stock-market swings, which investors now view as a necessary ingredient to a sustained boom. Diners might see an upside, too. Getting a table at Manhattan's hot new Alain Ducasse restaurant used to be impossible. Not anymore. For that, Greenspan & Co. may still be worth toasting.

单选题The first Muslims to come to Australia were______.

单选题Every community requires a Uwholesome/U, dependable supply of water, and every community generates liquid and solid wastes.

单选题{{B}}Text 4{{/B}} The Pakistani president, Gen. Pervez Musharraf, announced here today that a delegation of Pakistani officials would fly to the Taliban~ s headquarters in the southern Afghan city of Kandahar Monday to renew demands that the militia surrender Saudi fugitive Osama Bin Laden. U.S. officials have named Bin Laden, who has been given shelter by the Taliban rulers in Afghanistan, as the prime suspect in Tuesday's terrorist attacks in Washington and New York. "We are aware of the gravity of the situation and know that in the lives of nations, such situations do arise that require making important decisions," Musharraf said at a meeting with Pakistani newspaper editors. The Taliban's leader, Mohammad Omar, has refused to give up Bin Laden, claiming he is not responsible for the U.S. attacks. "The Pakistan government is leaning on the Taliban government to hand over Osama to save this entire region from catastrophe," said Najam Sethi, editor of the weekly newspaper Friday Times, who participated in the meeting with Musharraf. "I am not sure whether there is much chance of that happening, but the pressure is on from the Pakistan government." Pakistan has been a key supporter of the Taliban, which controls more than 90 percent of Afghanistan and has enforced a strict interpretation of Islamic law in the country. Omar, the Taliban leader, today convened an emergency meeting of clerics(圣职人员) in the Afghan capital, Kabul. "As regards the possible attack by America on the sacred soil of Afghanistan, veteran honorable clerics should come to Kabul for a sharia decision," Omar said in a statement broadcast on the Taliban's Radio Shariat today. Sharia is Islamic law. Omar, who reportedly left Ms. Kandahar headquarters several days ago in anticipation of a U. S. attack, asked Afghans to pray and read the Koran to meet what he called a "test", according to the statement. He indicated he would not attend the meeting of clerics, though he reportedly met with a small group of senior clerics today. The Pakistan-based Afghan Islamic Press reported today it had received a statement from Bin Laden, dispatched by an aide from an undisclosed location in Afghanistan, in which he denied involvement in last week's attacks on the World Trade Center and the Pentagon. "I am residing in Afghanistan," the statement said, "I have taken an oath of allegiance to Omar which does not allow me to do such things from Afghanistan. We have been blamed in the past, but we were not involved."

单选题( ) they will produce cars next year or not hasn't been made clear.