单选题He expressed concern that the ship might be in distress .

单选题This is the unique solution to our current difficulty.A. onlyB. aloneC. singleD. lonely

单选题Of the following functions, which is NOT possessed by the navigation computer?

单选题He asserted that nuclear power was a safe and non-polluting energy source,

单选题The policeman wrote down all the {{U}}particulars{{/U}} of the accident．

单选题 阅读下面这篇短文，短文后列出了7个句子，请根据短文的内容对每个句子做出判断。如果该句提供的是正确信息，请选择A；如果该句提供的是错误信息，请选择B；如果该句的信息文章中没有提及，请选择C。 {{B}} The Threat to Kiribati{{/B}} The people of Kiribati are afraid that one day in the not-too-distant future, their country will disappear from the face of the earth - literally, Several times this year, the Pacific island nation has been flooded by a sudden high tide. These tides, which swept across the island and destroyed houses, came when there was neither wind nor rain. "This never happened before," say the older citizens of Kiribati. What is causing these mysterious high tides? The answer may well be global warming. When fuels like oil and coal are being burned, pollutants (污染物) are released; these pollutants trap heat in the earth's atmosphere. Warmer temperatures cause water to expand and also create more water by melting glaciers (冰川) and polar (极地的) ice caps. If the trend continues, scientists say, many countries will suffer. Bangladesh, for example, might lose one-fifth of its land. The coral (珊瑚) island nations of the Pacific, like Kiribati and the Marshall Islands, however, would face an even worse fate - they would be swallowed by the sea. The loss of these coral islands would be everyone's loss. Coral formations are home to more species than any other place on earth. The people of these nations feel frustrated. The sea, on which their economies have always been based, is suddenly threatening their existence. They don't have the money for expensive technological solutions like seawalls. And they have no control over the pollutants, which are being released mainly by activities in large industrialized countries. All they can do is to hope that industrialized countries will take steps to reduce pollution.

单选题 Science and Truth "FINAGLE" is not a word that most people associate with science. One reason is that the image of the scientist is of one who always collects data in an impartial {{U}} {{U}} 1 {{/U}} {{/U}}for truth. In any debate—over intelligence, schooling, energy—the {{U}} {{U}} 2 {{/U}} {{/U}}"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}} {{U}} 3 {{/U}} {{/U}}desired results. The latest of the finagle factor in action comes from Stephen Jay Gould, a Harvard biologist, {{U}} {{U}} 4 {{/U}} {{/U}}has examined the important 19th century work of Dr. Samuel George Morton. Morton was famous in his time {{U}} {{U}} 5 {{/U}} {{/U}}analysing the brain size of the skulls as a measure of intelligence. He concluded that whites had the {{U}} {{U}} 6 {{/U}} {{/U}}brains, that the brains of Indians and Blacks were smaller, and therefore, that whites constitute a superior race. Gould went back to Morton's original data and concluded that the {{U}} {{U}} 7 {{/U}} {{/U}}were an example of the finagle at work. He found that Morton's "discovery" was made by leaving out embarrassing data, using incorrect procedures, making simple arithmetical {{U}} {{U}} 8 {{/U}} {{/U}}(always in his favour) 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}} {{U}} 9 {{/U}} {{/U}}. But Gould went on to say Morton's story is only an example of a common problem in {{U}} {{U}} 10 {{/U}} {{/U}}work. Some of the leading figures in science are believed to have {{U}} {{U}} 11 {{/U}} {{/U}}the finagle factor. Gould says that Isaac Newton fudged out to support at least three central statements that he could not prove. And so {{U}} {{U}} 12 {{/U}} {{/U}}Claudius Ptolemy, the Greek astronomer, whose master work, Almagest, summed up the case for a solar system that had the earth as its center. Recent studies indicate that Ptolemy {{U}} {{U}} 13 {{/U}} {{/U}}faked some key data or resorted heavily to the finagle factor. All this is {{U}} {{U}} 14 {{/U}} {{/U}}because the finagle factor is still at work. For example, in the artificial sweetener controversy, for example, it is said that all the studies sponsored by the sugar industry find that the artificial sweetener is unsafe, while all the studies sponsored by the diet food industry find nothing {{U}} {{U}} 15 {{/U}} {{/U}}with it.

单选题Alice laid her baby on the sofa tenderly and wrapped it with a blanket.

单选题You'd better put these documents in a {{U}}Safe{{/U}} place．

单选题I have been trying to quit smoking.

单选题Plant Gas Scientists have been studying natural sources of methane for decades but hadn't regarded plants as a producer, notes Frank Keppler, a geochemist at the Max Planck Institute for Nuclear Physics in Heidelberg, Germany. Now Keppler and his colleagues find that plants, from grasses to trees, may also be sources of the greenhouse gas. This is really surprising, because most scientists assumed that methane production requires an oxygen-free environment. Previously, researchers had thought that it was impossible for plants to make significant mounts of the gas. They had assumed that microbes need to be in environments without oxygen to produce methane. Methane is a greenhouse gas, like carbon dioxide. Gases such as methane and carbon dioxide trap heat in Earth's atmosphere and contribute to global warming. In its experiments, Keppler's team used sealed chambers that contained the same concentration of oxygen that Earth's atmosphere has. They measured the amounts of methane that were released by both living plants and dried plant material, such as fallen leaves. With the dried plants, the researchers took measurement at temperatures ranging from 30 degrees Celsius to 70 degrees C. At 30 degrees C, they found, a gram of dried plant material released up to 3 nanograms of methane per hour. ( One nanogram is a billionth of a gram. ) With every 10-degree rise in temperature, the amount of methane released each hour roughly doubled. Living plants growing at their normal temperatures released as much as 370 nanograms of methane per gram of plant tissue per hour. Methane emissions tripled when living and dead plant was exposed to sunlight. Because there was plenty of oxygen available, it's unlikely that the types of bacteria that normally make methane were involved. Experiments on plants that were grown in water rather than soil also resulted in methane emissions. That's another strong sign that the gas came from the plants and not soil microbes. The new finding is an "interesting observation," says Jennifer Y. King, a biogeochemist at the University of Minnesota in St. Paul. Because some types of soil microbes consume methane, they may prevent plant-produced methane from reaching the atmosphere. Field tests will be needed to assess the plant's influence, she notes.

单选题On a bright autumn day, my family went to climb the Fragrance Mountain.A. dullB. sunnyC. cloudyD. clear

单选题The eternal motion of the stars fascinated him.

单选题Have you filled up the form? Of all things in the world, I most dislike filling up forms ; in fact, I have a (51) horror of it. Applying for a living license, (52) for an evening course, booking a holiday abroad-everything nowadays seem to involve (53) information about one's personal life and habits that has little or nothing to do with the matter (54) hand. When applying for a job, it may be (55) some obscure interest to a (56) employer to learn that I collect stamp or had measles as a child, but why should he conceivably want to know that my father was a tobacconist who died in 1988? The authorities who (57) one to fill up forms, frequently demand answers to questions that one would hesitate to put (58) one's intimate friends. The worst of it is that, when (59) with such questions, my mind goes blank. Have I ever suffered from a serious illness? My mother always assured me I was "delicate". Do I suffer from any personal defects? Well, I wear contact lenses and my upper teeth are not my own, but perhaps the word "defects" (60) to my character. Am I supposed to (61) that I like gambling, and find it difficult to get up in the morning? Both of them are true. Of all, I think job applications are the worst, "education"—previous experience—post held give (62) ... Terrified by the awful warning about giving false (63) which appear at the bottom of the form, I struggle to remember what exams I passed and how long I worked for what firms. (64) hard I try, there always seems to be a year or two for which I cannot satisfactorily account and which I am certain, if left (65) , will give the impression that I was in prison or engaged in some occupation too dubious to mention.

单选题After supper we usually take a stroll around the park for about an hour.A. walkB. restC. bathD. breath

单选题The constant friction of the wire on the metal pulley eventually caused it to break. A. declining B. ageing C. pulling D. rubbing

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}}Singing Alarms Could Save the Blind{{/B}} If you cannot see, you may not be able to find your way out of a burning building -- and that could be fatal. A company in Leeds could change all that{{U}} (51) {{/U}}directional sound alarms capable of guiding you to the exit. Sound Alert, a company{{U}} (52) {{/U}}the University of Leeds, is installing the alarms in a residential home for{{U}} (53) {{/U}}people in Sommerset and a resource centre for the blind in Cumbria. {{U}}(54) {{/U}} produce a wide range of frequencies that enable the brain to determine where the{{U}} (55) {{/U}}is coming from. Deborah Withington of Sound Alert says that the alarms use most of the frequencies that can be{{U}} (56) {{/U}} by humans. "It is a burst of white noise {{U}}(57) {{/U}}people say sounds like static on the radio," she says. "Its life-saving potential is great." She conducted an experiment in which people were filmed by thermal-imaging cameras trying to find their way out of a large{{U}} (58) {{/U}}room. It{{U}} (59) {{/U}}them nearly four minutes to find the door {{U}}(60) {{/U}}a sound alarm, but only 15 seconds with one. Withington studies how the brain {{U}}(61) {{/U}}sounds at the university. She says that the {{U}}(62) {{/U}} of a wide band of frequencies can be pinpointed more easily than the source of a narrow band. Alarms{{U}} (63) {{/U}}the same concept have already been installed on emergency vehicles. The alarms will also include rising or falling frequencies to indicate whether people should go up{{U}} (64) {{/U}}down stairs. They were{{U}} (65) {{/U}}with the aid of a large grant from British Nuclear Fuels.

单选题Knowing that I had been out of work now, they were unwilling to lend me money.

单选题The music was a little loud, but {{U}}except{{/U}} that it was a great concert.

单选题Unidentified Flying Object Unidentified Flying Object (UFO) is any object or light, reportedly sighted in the sky, that cannot be immediately explained by the observer. Sightings of unusual flying objects date back to ancient times, but UFOs (sometimes called flying saucers) became widely discussed only after the first widely publicized US sighting in 1947. Many thousands of such observations have since been reported worldwide. At least 90 percent of UFO sightings can be identified as conventional objects, although time-consuming investigations are often necessary for such identification. The objects most often mistaken for UFOs are bright planets and stars, aircraft, birds, balloons, kites, aerial flares, peculiar clouds, meteors, and satellites. The remaining sightings most likely can be attributed to other mistaken sightings or to inaccurate reporting, tricks, or delusions, although to disprove all claims made about UFOs is impossible. From 1947 to 1969 the US Force investigated UFOs as a possible threat to national security. A total of 12,618 reports were received, of which 701 reports, or 5.6 percent, were listed as unexplained. The air force concluded that "no UFO reported, investigated, and evaluated by the Air Force has ever given any indication of threat to our national security." Since 1969 no agency of the US government has had any active program of UFO investigation. Some persons, however, believe that UFOs are extraterrestrial spacecraft, even though no scientifically valid evidence supports that belief. The possibility of extraterrestrial civilizations is not the stumbling block; most scientists grant that intelligent life may well exist elsewhere in the universe. A fully convincing UFO photograph has yet to be taken, however, and the scientific method requires that highly speculative explanations should not be adopted unless all of the more ordinary explanations can be ruled out. UFO enthusiasts persist, however, and some persons even claim to have been captured and taken aboard UFOs. No one has produced scientifically acceptable proof of these claims. Behavioral scientist Carl Sagan once proposed that "certain psychological needs are met by belief in superior beings from other worlds."