单选题Judging from the context, Scarsdale is a place inhabited by ______.

单选题The place did not seem to be popular, for it was completely deserted, and in any case ______ to traffic.

单选题 to get from Kathmandu to the tiny village in Nepal, Dave Irvine-Halliday spent more than two days. When he arrived, he found villagers working and reading around battery-powered lamps equipped with light-emitting diodes, or LEDs--the same lamps he had left there in 2000. Irvine-Halliday, an American photonics engineer, was not surprised. He chose to use LED bulbs because they are rugged, portable, long-lived, and extremely efficient. Each of his lamps produces a useful amount of illumination from just one watt of power. Villagers use them about four hours each night, then top off the battery by pedaling a generator for half an hour. The cool, steady beam is a huge improvement over lamps still common in developing Countries. In fact, LEDs have big advantages over familiar incandescent (白炽的)lights as well--so much so that Irvine-Halliday expects LEDs will eventually take over from Thomas Edison's old lightbulb as the world's main source of artificial illumination. The dawn of LEDs began about 40 years ago, but early LEDs produced red or green glows suitable mainly for displays in digital clocks and calculators. A decade ago, engineers invented a semiconductor crystal made of an aluminum compound that produced a much brighter red light. Around the same time, a Japanese engineer developed the first practical blue LED. This small advance had a huge impact because blue, green, and red LEDs can be combined to create most of the colors of the rainbow, just as that in a color television picture. These days, high-intensity color LEDs are showing up everywhere such as the traffic lights. The reasons for the rapid switchover are simple. Incandescent bulbs have to be replaced annually, but LED traffic lights should last five to yen years. LEDs also use 80 to 90 percent less electricity than the conventional signals they replace. Collectively, the new traffic lights save at least 400 million kilowatt-hours a year in the United States. Much bigger savings await if LEDs can supplant Mr. Edison's bulb at the office and in the living room. Creating a white-light LED that is energy-saving, cheap and appealing has proved a tough engineering challenge. But all the major lightbulb makers--including General Electric, Philips, and Osram-Sylvania -- are teaming up with semiconductor manufacturers to make it happen.

单选题The Belgian group reached the conclusion that ______.

单选题According to the author, all animals ______.

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

单选题Though afflicted by headaches, nausea, and respiratory difficulties, Nietzsche refused to let his ______ problems prevent him from writing.

单选题The passage suggests that by the late Colonial period the tendency to cultivate metropolitan cultural models was a cultural pattern that was ______.

单选题I found it difficult to______my career ambitions with the need to bring up my children.(中南大学2006年试题)

单选题The chairman of the company said that new techniques had ______ improved their production efficiency. A. violently B. severely C. extremely D. radically

单选题Within hours of appearing on television to announce the end of conscription, President Jacques Chirac moved quickly to prevent any dissent from within the military establishment. Addressing more than 500 military staff officers at the military academy in Paris yesterday, Mr. Chirac said clearly that he "expected" their loyalty in the work of rebuilding France's national defense. He understood their "legitimate concerns, questions and emotions" at the reforms, but added. "You must understand that there is not and never has been any rigid model for French defense. Military service has been compulsory for less than a century. Realism required that our armed forces should now be professional." The president's decision to abolish conscription over a period of six years removes a rite of passage for young Frenchmen that has existed since the Revolution, even though obligatory national service only became law in 1905. As recently as 1993, an opinion poll showed that more than 60% of French people said they feared the abolition of conscription could endanger national security. A poll conducted this month, however, showed that 70% of those asked favored ending of practice, and on the streets and in offices yesterday, the response to Mr. Chirac's announcement was generally positive. Among people who completed their 10-month period of national service in the last few years or were contemplating the prospect, there was almost universal approval, tempered by a sense that something hard to define--mixing with people from other backgrounds, a formative experience, a process that encouraged national or social cohesion--might be lost. Patrick, who spent his year in the French city of Valance assigning and collecting uniforms, and is now a computer manager, said he was in tears for his first week, and hated most of his time. He thought it was "useless" as a form of military training-- "I only fired a rifle twice"--but, in retrospect, useful for learning how to get on with people and instilling patriotism. As many as 25% of those liable for military service in France somehow avoid it--the percentage is probably much greater in the more educated and higher social classes. According to Geoffroy, a 26-year-old reporter, who spent his time in the navy with the information office in central Paris, the injustice is a good reason for abolishing it. People with money or connections, he said, can get well-paid assignments abroad. "It's not fair: some do it, some don't." Several expressed support for the idea of a new socially-oriented voluntary service that would be open to both men and women. But the idea seemed less popular among women. At present, women have the option of voluntary service and a small number choose to take it.

单选题{{B}}Passage 4{{/B}} Foreign propagandists have a strange misconception of our national character. They believe that we Americans must be hybrid, mongrel, undynamic; and we are called so by the enemies of democracy because, they say, so many races have been fused together in our national life. They believe we are disunited and defenseless because we argue with each other, because we engage in political campaigns, because we recognize the sacred right of the minority to disagree with the majority and to express that disagreement even loudly. It is the very mingling of races, dedicated to common ideals, which creates and recreates our vitality. In every representative American meeting there will be people with names like Jackson and Lincoln and Isaacs and Schultz and Kovack and Sartori and Jones and Smith. These Americans with varied. backgrounds are all immigrants or the descendants of immigrants. All of them are inheritors of the same stalwart tradition of unusual enterprise, of adventurousness, of courage--courage to "pull up stakes and git moving". That has been the great compelling force in our history. Our continent, our hemisphere, has been populated by people who wanted a life better than the life they had previously known. They were willing to undergo all conceivable hardships to achieve the better life. They were animated, just as we are animated today, by this compelling force. It is what makes us Americans.

单选题Two travelers engaged in a warm dispute about the color of the Chameleon. One of them affirmed it was blue, that he had seen it with his own eyes upon the naked branch of a tree, feeding on the air in a very clear day. The other strongly asserted it was green, and that he had viewed it very closely and minutely upon the broad leaf of a fig tree. Both of them were positive, and the dispute was rising to a quarrel; but a third person luckily coming by, they agreed to refer the question to his decision. "Gentlemen," said the Arbitrator, "You could not have been more lucky in your reference, as I happen to have caught one of them last night; but, indeed, you are both mistaken, for the creature is totally black." "Black, impossible." "Nay," said the Umpire, with great assurance, "the matter may be soon decided, for I immediately enclosed my Chameleon in a little box, and here it is." So saying, he drew it out of his pocket, opened the box, and, lo! It was white as snow.

单选题The phrase "stumbling block" may best refer to ______.

单选题All his attempts to argue about the rightness were ______. A. futile B. not important C. effective in use D. without reason

单选题Excessive intake of animal protein and fats, dangerous imbibing of alcohol, use of tobacco and drugs, and dangerous recreational sports and driving habits are all possible only because of affluence.

单选题Many of his arguments have no {{U}}pertinence{{/U}} to the subject under discussion.

单选题As I recall my plane trip around the world last July and August, I think my difficulty was the adjustment to the different ______ served with the food in the various cities we visited. A. seasonings B. qualities C. grades D. ingedients