单选题Medieval cities grew rapidly when they had {{U}}harbors{{/U}} nearby.

单选题阅读下面这篇短文，短文后列出7个句子，请根据短文的内容对每个句子做出判断。 {{B}}Ancient Water From Afar{{/B}} It streaked across the sky on a warm March evening last year, then crashed into a street in the small town of Monahans, Texas. When seven boys quit their basketball game to inspect the damage, they found a shiny, black grapefruit-size rock settled in the asphalt (沥青). Word of the “flaming rock” traveled quickly in newspapers and on TV. The next day, NASA scientist Everett Gibson arrived and took the meteorite(陨石) , later named Monahans 1998, back to a lab in Houston. There researchers broke open the extraterrestrial (地球外的)rock with a hammer and chisel (凿子). To their surprise, they struck water. A team led by Michael Zolensky of the Johnson Space Center reports this discovery in a journal. It’s the first time anyone has found liquid water in an object from space—and a suggestion that life may exist out side our planet. Meteorites containing water are probably not scarce, Zolensky says. But by the time researchers get their hands on the rocks, minerals that trap the water have dissolved away, and the water have evaporated. Worse, some researchers destroy the evidence by cutting meteor ites open with rock saws and water. “I’m betting this isn’t such a rare finds it’s just that people have been mistreating their meteorites,” Zolensky says. Of course, Zolensky’s team did get a bit lucky. Monahans 1998 was safe in their lab less than two days after it hit the Earth, so they examined an unusually fresh sample. The scientists were keen to find vivid purple crystals of halite (岩盐)inside the meteorite, since halite is a salt mineral usually formed from liquid water. Even more curious were the hundreds of tiny bubbles suspended in the halite crystals. Zolensky’s team analyzed the bubbles by shining a laser beam through them and confirmed they were made of salty brine (盐水). By dating the halite, Zolensky’s team found the water trapped inside it formed at least 4.5 billion years ago, back when most scientists believe our solar system was born. That means the briny object amy help researchers learn about the gaseous nebulas(星云)that gave rise to our sun and planets. But how did the meteorite get wet? One possibility is that a passing comet smashed into the rock, dropping off a load of liquid water. Or the rock might have chipped off an asteroid (小行星)that holds pools of fluid. Zolensky’s team still needs to study whether the water comes from our own solar system. One thing is certain, however: the Monahans meteorite will fuel the debate on extraterrestrial life, “Water is a life-giver, so if you want to study where life came from in the solar system, you have to follow where water came from,” Zolensky says. A wet rock from space doesn’t mean little green men are coming soon to a planet near you, but it does raise hopes that we’re not alone in the universe.

单选题"Initial expectations were too great, "explained Alex Slawsby, senior analyst of mobile devices at IDC (International Data Company)of US. " It was a solution to a problem no one thought they had. " But now, helped by growing industry support, shipments of Bluetooth devices are expected to increase about 60 per cent in 2004 to 88 million units. That's up from 55 million sold in 2003, according to US research firm Gartner. How many units of Bluetooth were sold in 2003?A. 88 millionB. 55 millionC. 33 millionD. 60% more than the previous year.

单选题Did anyone{{U}} call {{/U}}me when was out?

单选题I can no longer tolerate his actions.

单选题The love of money is the root of all evil.A. resultB. endC. forceD. cause

单选题Experiments enable young scientists to judge accurately what must be accepted and what must be viewed with suspicion. A. doubt B. belief C. curiosity D. judgment

单选题We have to hurry up since we have no ______ time to finish it.A. sufficientB. additionalC. efficientD. consequent

单选题The polar {{U}}regions{{/U}} are generally covered with ice and snow.

单选题He confessed that he did not read the assigned book. A. answered B. agreed C. admitted D. alleged

单选题Nowadays, we can purchase things on-line. A. read B. buy C. rent D. watch

单选题The food we have is inadequate .

单选题Mary is Ulooking/U for the book she lost yesterday.

单选题The industrial revolution {{U}}modified{{/U}} the whole structure of English society，

单选题More resources are being allocated to the project.

单选题 阅读下面的短文，文中有15处空白，每处空白给出了4个选项，请根据短文的内容从 4个选项中选择1个最佳答案。 {{B}}Science and Truth{{/B}} "FINAGLE" (欺骗) is not a word that most people associate with science. One reason is that the image of the scientist is of one who always{{U}} (51) {{/U}}data in an impartial (不偏不倚的) search for truth~ In any debate -- {{U}}(52) {{/U}}intelligence, schooling, energy -- the phrase "science says" usually disarms opposition. But scientists have long acknowledged the existence of a "finagle factor" -- a tendency by many scientists to give a helpful change to the data to{{U}} (53) {{/U}} desired results. The latest of the finagle factor in action comes from Stephen Jay Gould, a Harvard biologist, who has{{U}} (54) {{/U}}the important 19th century work of Dr. Samuel George Morton. Morton was famous in his time for analysing the brain {{U}}(55) {{/U}}of the skulls as a measure of intelligence. He concluded that whites had the largest brains, that the brains of Indians and blacks were smaller, and {{U}}(56) {{/U}}, that whites constitute a superior race. Gould went back to Morton's original data and concluded that the{{U}} (57) {{/U}} were an example of the finagle at work. He found that Morton's "discovery" was made by leaving out embarrassing data,{{U}} (58) {{/U}}incorrect procedures, and changing his criteria -- again, always in favour of his argument. Morton has been thoroughly discredited by now and scientists do not believe that brain size reflects{{U}} (59) {{/U}}. But Gould went on to say Morton's story is only an example of a common problem in {{U}}(60) {{/U}}work. Some of the leading figures in science are{{U}} (61) {{/U}}to have used the finagle factor. Gould says that Isaac Newton fudged out (捏造) to support at least three central statements that he could not prove. And so{{U}} (62) {{/U}} Laudius Ptolemy, the Greek astronomer, whose master work, Almagest, summed up the case for a solar system that had the earth as its centre. Recent{{U}} (63) {{/U}} indicate that Ptolemy either faked some key data or resorted heavily to the finagle factor. All this is important because the finagle factor is still at work. For example, in the artificial sweetener controversy, for example, it is{{U}} (64) {{/U}}that all the studies sponsored by the sugar industry find that the artificial sweetener is unsafe, {{U}}(65) {{/U}}all the studies sponsored by the diet food industry find nothing wrong with it.

单选题Black Holes Most scientists agree that black holes exist but are nearly impossible to locate. A．black hole in the universe is not a solid object, like a planet, but it is shaped like a sphere (球体). Astronomers (天文学家) think that at the center of a black hole there is a single point in space with infinite (无限的) density (稠密). This single point is called a singularity (奇点). If the singularity theory is correct, it means that when a massive star collapses, all the material in it disappears into the singularity. The center of a black hole would not really be a hole at all, but an infinitely dense point. Anything that crosses the black hole is pulled in by its great gravity. Although black holes do exist, they are difficult to observe. These are the reasons. ·No light or anything else comes out of black holes. As a result, they are invisible to a telescope. ·In astronomical terms, black holes are truly tiny. For example, a black hole formed by the collapse of a giant star would have an event horizon (视界) only 18 miles across. ·The nearest black holes would be dozens of light years away from Earth. One light year is about 6 trillion (万亿) miles. Even the most powerful telescopes could not pick out an object so small at such a great distance. In 1994 the Hubble Space Telescope provided evidence that black holes exist. There are still answers to be found, however, so black holes remain one of the mysteries of the universe.

单选题下面有3篇短文，每篇短文后有5道题。请根据短文内容，为每题定1个最佳选项。{{B}}第一篇{{/B}} Smart Window Windows not only let light in to cut down an electricity use for lighting, but the light coming through the window also provides heat. However, windows are not something people typically associate with being a cutting edge technology. Researchers are now working on new technologies that enable a window to quickly change from clear to dark and anywhere in between with a flip of a switch. "It took us a long time to figure out what a window really is," says Claes Granqvist. He's a professor of solid-state physics at Uppsala University in Sweden. "It's contact with the outside world. You have to have visual contact with the surrounding world to feel well. " So, windows and natural light are important for improving the way people feel when they're stuck indoors. Yet, windows are the weak link in a building when it comes to energy and temperature control. In the winter, cold air leaks in. When it's hot and sunny, sunlight streams in. All of this sunlight carries lots of heat and energy. And all of this extra heat forces people to turn on their air conditioners. Producing blasts of cold air, which can feel so refreshing, actually suck up enormous amounts of electricity in buildings around the world. Windows have been a major focus of energy research for a long time. Over the years, scientists have come up with a variety of strategies for coating, glazing, and layering windows to make them more energy efficient. Smart windows go a step further. They use chromogenic technologies which involve changes of color. Electrochromic windows use electricity to change color. For example, a sheet of glass coated with thin layers of chemical compound such as tungsten oxide works a bit like a battery. Tungsten oxide is clear when an electric charge is applied and dark when the charge is removed, that is, when the amount of voltage is decreased, the window darkens until it's completely dark after all electricity is taken away. So applying a voltage determines whether the window looks clear or dark. One important feature that makes a smart window so smart is that it has a sort of "memory. " All it takes is a small jolt of voltage to turn the window from one state to the other. Then, it stays that way. Transitions take anywhere from 10 seconds to a few minutes, depending on the size of the window. The development of smart windows could mean that massive air conditioning systems may no longer need. "In the future," Granqvist says, "our buildings may look different. "

单选题I was surprised to find that they all fell in with my suggestion at once.

单选题Mary McCarthy’s satires are {{U}}couched{{/U}} in a prose style that has a classic precision.