单选题The square is 500 yards wide, five times______the size of St. Peter's in Rome.

单选题Suppose you have a brick and a sponge which are exactly the same size. The brick and the sponge will occupy the same amount of space, but they will not weigh the same. If two things are exactly the same size, but differ in weight, then they have different densities. The one with the greater weight for the same size has the greater density. The one with lower weight for the same size has the lower density. Now apply this idea to fluids. You know that water and air expand when they are heated and therefore become less dense. If you poured a cupful of very hot water and let it cool, you would have a little less than a cupfull of cool water. If you weighed a cupful of very hot water and a cupful of cool water, the cupful of very hot water would weigh a little less. The cupful of cool water, being a little heavier than the cupful of hot water, would really have a little more water in it. Cold water is denser than hot water. Likewise, cold air is denser than hot. air. The greater weigh! of !he denser material makes it fall to the bottom of the container. It pushes up the less dense material.

单选题According to a survey, which was based on the responses of over 188,000 students, today's traditional-age college freshmen are "more materialistic and less altruistic (利他主义的)"than at any time in the 17 years of the poll. Not surprising in these hard times, the student's major objective "is to be financially well off. Less important than ever is developing a meaningful philosophy of life." It follows then that today the most popular course is not literature or history but accounting. Interest in teaching, social service and the "altruistic" fields is at a low. On the other hand, enrollment in business programs, engineering and computer science is way up. That's no surprise either. A friend of mine (a sales representative for a chemical company) was making twice the salary of her college instructors her first year on the job--even before she completed her two-year associate degree. While it's true that we all need a career, it is equally true that our civilization has accumulated an incredible amount of knowledge in fields far removed from our own and that we are better for our understanding of these other contributions- be they scientific or artistic. It is equally true that, in studying the diverse wisdom of others, we learn how to think. More important, perhaps, education teaches us to see the connections between things, as well as to see beyond our immediate needs. Weekly we read of unions who went on strike for higher wages, only to drive their employer out of business. No company; no job. How shortsighted in the long run! But the most important argument for a broad education is that in studying the accumulated wisdom of the ages, we improve our moral sense. I saw a cartoon recently which shows a group of businessmen looking puzzled as they sit around a conference table; one of them is talking on the intercom (对讲机): "Miss Baxter," he says, "could you please send in someone who can distinguish right from wrong?" From the long-term point of view, that's what education really ought to be about.

单选题[此试题无题干]

单选题Tom owns ______ larger collection of ______ books than any other students in our class.A. the ; /B. a; /C. a ; theD. /; the

单选题A: Hi, I'm your neighbor in 405, next door. I'm Sunny Chan. B: ______

单选题She could have cried, but she had no time to dwell ______her disappointment, for suddenly a harsh voice hailed her from below. A. on B. at C. in D. for

单选题To compensate for the substantial decline in the availability of fossil fuels in future years, we will have to provide at least ______ alternative energy source.(2014年北京航空航天大学考博试题)

单选题A. knee B. know C. kick D. knife

单选题These technological advances in communication have______ the way people do business.(2006年厦门大学考博试题)

单选题The ______ of three and five is four. A. avenue B. subtraction C. average D. total

单选题The patients______ symptoms to get appointments quicker and ask doctors to hide the truth from insurance companies. A. feign B. obstruct C. coinage D. conjure

单选题Identical twin sisters have led British scientists to a breakthrough in leukemia research that Upromises /Umore effective therapies with fewer harmful side-effects.

单选题The weakened governor could not withstand another catastrophe.

单选题His doctor has told him he mustn't drink, but he still has the occasional brandy______. (2013年3月中国科学院考博试题)

单选题Louis Braille designed a form of communication enabling people to ______ and preserve their thoughts by incorporating a series of dots which were read by the finger tips. A. retain B. visualize C. convey D. transfer

单选题Ever since its discovery, Pluto has never really fitted in. After the pale and glowing giant Neptune, it is little more than a cosmic dust mite, swept through the farthest reaches of the solar system on a planet wildly tilted relative to the rest of the planets. It is smaller than Neptune's largest moon, and the arc of its orbit is so oval that it occasionally crosses its massive blue neighbor's path. For years, it has been seen as our solar system's oddest planet. Yesterday, however, scientists released perhaps the most convincing evidence yet that Pluto, in fact, is not a planet at all. For the first time, astronomers have peered into a belt of rocks beyond Pluto unknown until 10 years ago—and found a world that rivals Pluto in size. The scientists posit that larger rocks must be out there, perhaps even larger than Pluto, meaning Pluto is more likely the king of this distant realm of space detritus than the tiniest of the nine planets. When discovered in 1930, "Pluto at that point was the only thing (that far) out there, so there was nothing else to call it but a planet," says Mike Brown, an astronomer at the California Institute of Technology in Pasadena. "Now it just doesn't fit." In one sense, the question of Pluto's planetary status is arcane, the province of pocket-protected scientists and sun-deprived pen pushers determined to decide some official designation for a ball of dust and ice 3 billion miles away. Yet it is also unquestionably something more. From science fair dioramas to government funding, planets hold a special place in the public imagination, and how Pluto is eventually seen—by kids and Congress alike—could shape what future generations learn about this mysterious outpost on the edge of the solar system. The debate has split the astronomical community for decades. Even before the distant band of rocks known as the Kuiper Belt was found, Pluto's unusual behavior made it suspicious. Elsewhere, the solar system fit into near families: the rocky inner planets, the asteroid belt, the huge and gaseous outer planets. Pluto, though, was peculiar. With the discovery of the Kuiper Belt—countless bits of rock and ice left unused when the wheel of the solar system first formed—Pluto suddenly seemed to have cousins. Yet until yesterday, it held to its planetary distinction because it was far larger than anything located there. The rub now is Quaoar (pronounced KWAH-oar), 1 billion miles beyond Pluto and roughly half as large. Named after the creation force of the tribe that originally inhabited the Los Angeles basin, Quaoar forecasts problems for the erstwhile ninth planet, says discoverer Dr. Brown: "The case is going to get a lot harder to defend the day somebody finds something larger than Pluto," To some, the problem is not with Pluto, but the definition of "planet. "In short, there is none. To the Greeks, who coined the term, it meant "wanderer," describing the way that the planets moved across the night sky differently from the stars behind them. Today, with our more nuanced understanding of the universe, the word no longer has much scientific meaning. New York's Hayden Planetarium caused a commotion two years ago by supposedly demoting Pluto, lumping it with the Kuiper Belt objects in its huge mobile of the solar system. In reality, however, the planetarium was making a much broader statement, says Nell Degrasse Tyson, an astrophysicist there. The textbooks of the future should focus more on families of like objects than "planets." The discovery of Quaoar strengthens this idea. "Everyone needs to rethink the structure of our solar system," he says. "We've just stopped counting planets." Still, many are loath to part with the planet Pluto. They note that Pluto, in fact, is distinct from many Kuiper Belt objects. It has a thin atmosphere, for one. It reflects a great deal of light, while most Kuiper Belt objects are very dark. And unlike all but a handful of known Kuiper Belt objects, it has a moon. "Maybe Pluto, then, should be representative of a new class of planets," says Mark Sykes, an astronomer at the University of Arizona in Tucson. "It's the first example, and we are just beginning to find this category./

单选题Chomsky follows______in philosophy and mentalism in psychology.