单选题They left at nine, so they ______ by now.

单选题The U. S. Senate unanimously passed a resolution ______ Israel's military attack on Lebanon.

单选题In many buildings hot water ______ through pipes to keep rooms warm.

单选题Whenever I hear a weather report declaring it's the hottest June 10 on record or whatever, I can't take it too seriously, because "ever" really means "as long as the records go back" , which is only as far as the late 1800s. Scientists have other ways of measuring temperatures before that, though—not for individual dates, but they can tell the average temperature of a given year by such proxy measurements as growth marks in corals, deposits in ocean and lake sediments, and cores drilled into glacial ice. They can even use drawings of glaciers as there were hundreds of years ago compared with today. And in the most comprehensive compilation of such data to date, says a new report from the National Research Council, it looks pretty certain that the last few decades have been hotter than any comparable period in the last 400 years. That's a blow to those who claim the current warm spell is just part of the natural up and down of average temperatures—a frequent assertion of the global—warming-doubters crowd. The report was triggered by doubts about past-climate claims made last year by climatologist Michael Mann, of the University of Virginia(he's the creator of the "hockey stick" graph AI Gore used in "An Inconvenient Truth" to dramatize the rise in carbon dioxide in recent years). Mann claimed that the recent warming was unprecedented in the past thousand years—that led Congress to order up an assessment by the prestigious Research Council. Their conclusion was that a thousand years was reasonable, but not overwhelmingly supported by the data. But the past 400 was—so resoundingly that it fully supports the claim that today's temperatures ale unnaturally warm, just as global warming theory has been predicting for a hundred years. And if there's any doubt about whether these proxy measurements are really legitimate, the NRC scientists compared them with actual temperature data from the most recent century, when real thermometers were in widespread use. The match was more or less right on. In the past nearly two decades since TIME first put global warming on the cover, then, the argument against it has gone from "it isn't happening" to "it's happening, but it's natural" , to "it's mostly natural" —and now, it seems, that assertion too is going to have to drop away. Indeed. Rep. Sherwood Boehert, the New York Republican who chairs the House Science Committee and who asked for the report declared that it did nothing to support the notion of a controversy over global warming science—a controversy that opponents keep insisting is alive. Whether President Bush will finally take serious action to deal with the warming, however, is a much less settled question.

单选题Watching news program at night has become an ______ part of the lives of most people in big cities. A. automotive B. instructive C. unconventional D. integral

单选题The reporter refused to name the ______ of his information.

单选题If you ______ a heart-attack or stroke victim who needs your assistance, your first response should be to stay calm and urge bystanders to call for an ambulance.

单选题Carmen Arace Middle School is situated in the pastoral town of Bloomfield, Conn. , but four years ago it faced many of the same challenges as inner-city schools in nearby Hartford: low scores on standardized tests, dropping enrollment and high rates of detention. Then the school's hard-driving principal, Delores Bolton, persuaded her board to shake up the place by buying a laptop computer for each student and teacher to use, in school and at home. For good measure, the board provided wireless Internet access at school. Total cost: $2. 5 million. Now, an hour before classes start, every seat in the library is taken by students eager to get online. Fifth-grade teacher Jen Friday talks about sedimentary rocks as students view them at a colorful website. After school, students on buses pull laptops from backpacks to get started on homework. Since the computers arrived, enrollment is up 20%. Disciplinary suspensions are down 80%. Scores on state achievement tests are up 35%. Bolton, who is black, is proud to run "a school with 90% black enrollment that is on the cutting edge. " Indeed, school systems in rural Maine and New York City are eager to follow Arace Middle School's example. Governor Angus King has proposed using $50 million from an unexpected budget surplus to buy a laptop for all of Maine's 17, 000 seventh-graders — and for new seventh-graders each fall. The funds would create a permanent endowment whose interest would help buy the computers. The plan, scaled back to $ 30 million in a compromise with the legislature, is scheduled to be voted on this week. In the same spirit, the New York City board of education voted unanimously on April 12 to create a school Internet portal, which would make money by selling ads and licensing e-commerce sites. The portal will also provide e-mail service for the city's 1.1 million public school students. Profits will be used to buy laptops for each of the school system's 87, 000 fourth-graders. Within nine years, all students in grades 4 and higher will have their own computers. Back in Bloomfield, the school board is seeking federal grant money to expand its laptop program to high school students. In the meantime, most of the kinks have been worked out. Some students were using their computers to goof off or visit unauthorized websites. But teachers have the ability to track where students have been on the Web and to restrict them. "That is the worst when they disable you," says eighth-grade honors student Jamie Bassell. "You go through laptop withdrawal. " The habit is rubbing off on parents. "I taught my mom to use e-mail," says another eighth-grader, Katherine Hypolite. "And now she's taking computer classes. I'm so proud of her!"

单选题 There are exceptions to the rule of male insects being smaller than the females, and some of these exceptions are intelligible. Size and strength would be an advantage to the males which fight for the possession of the females, and in these cases, as with the stag-beetle (Lucanus), the males are larger than the females. There are, however, other beetles which are not known to fight together, of which the males exceed the females in size, and the meaning of this fact is not known, but in some of these cases, as with the huge Dynastes and Megasoma, we can at least see that there would be no necessity for the males to be smaller than the females, in order to be matured before them, for these beetles are not short-lived, and there would be ample time for the pairing of the sexes.

单选题{{B}}Passage One{{/B}} As one works with color in a practical or experimental way, one is impressed by two apparently unrelated facts. Color as seen is a mobile changeable thing depending to a large extent on the relationship of the color to other colores seen simultaneously. It is not fixed in its relation to the direct stimulus which creates it. On the other hand, the properties of surfaces that give rise to color do not seem to change greatly under a wide variety of illumination colors, usually (but not always) looking much the same in artificial light as in daylight. Both of these effects seem to the due in large part to the mechanism of color adaptation mentioned earlier. When the eye is fixed on a colored area, there is an immediate readjustment of the sensitivity of the eye to color in and around the area viewed. This readjustment does not immediately affect the color seen but usually does affect the next area to which the gaze is shifted. The longer the time of viewing, the higher the intensity, and the larger the area, the greater the effect will be in terms of its persistence in the succeeding viewing situation. As indicated by the work of Wright and Schouten, it appears that, at least for a first approximation, full adaptation takes place over a very brief time if the adapting source is moderately bright and the eye has been in relative darkness just previously. As the stimulus is allowed to act, however, the effect, becomes more persistent in the sense that it takes the eye longer to regain its sensitivity to lower intensities. The net result is that, if the eye is so exposed and then the gaze is transferred to an area of lower intensity, the loss of sensitivity produced by the first area will still be present and appear as an "afterimage" super imposed on the second. The effect not only is present over the actual area causing the "local adaptation" but also spreads with decreasing strength to adjoining areas of the eye to produce "lateral adaptation". Also, because of the persistence of the effect if the eye is shifted around from one object to another, all of which are at similar brightnesses or have similar colors, the adaptation will tend to become uniform over the whole eye.

单选题The ceremony will ______ as soon as the president arrives.

单选题From the passage we can infer that a US counterpart of Vanables or Thompson would ______.

单选题 American suffers from an overdose of work{{U}} (51) {{/U}}who they are or what they do. They spend{{U}} (52) {{/U}}time at work than at any time since World War Ⅱ. In 1950, the US had fewer working hours than any other{{U}} (53) {{/U}}country. Today, it{{U}} (54) {{/U}}every country but Japan, where industrial employees log 2, 155 hours a year compared{{U}} (55) {{/U}}1, 951 in the US and 1, 603{{U}} (56) {{/U}}West employees. Between 1969 mad 1989, employed Americans{{U}} (57) {{/U}}an average of 138 hours to their yearly work schedules. The work-week{{U}} (58) {{/U}}at about 40 hours, but people are working more weeks each year.{{U}} (59) {{/U}}, paid time off-holidays, vacations, sick leave--{{U}} (60) {{/U}}15 percent in the 1990s. As corporations have{{U}} (61) {{/U}}stiffer competition and slower growth in productivity, they{{U}} (62) {{/U}}employees to work longer. Cost-cutting layoffs in the 1980s{{U}} (63) {{/U}}the professional and managerial ranks, leaving fewer people to get the job done. In lower-paid occupations{{U}} (64) {{/U}}wages have been reduced, workers have added hous{{U}} (65) {{/U}}over-time or extra jobs to{{U}} (66) {{/U}}their living standard. The Government estimates that more than seven million people hold a second job. For the first time, large{{U}} (67) {{/U}}of people say they want to cut{{U}} (68) {{/U}}on working hours, even if it means earning less money. But most employers are{{U}} (69) {{/U}}to let them do so. The government, which has stepped back from its traditional{{U}} (70) {{/U}}as a regulator of work time, should take steps to make shorter hours possible.

单选题Malaysian Airlines lost an airplane on March 8 last year, ______whereabouts still remains a mystery.

单选题In order to survive now and ______ in the future, all the working staff must constantly create new ideas for every aspect of your business. A. maximize B. thrive C. measures D. remain