单选题By turning this knob to the right you can ......... the sound from the radio.

单选题The exhibition is designed to ________ further cooperation between the two countries.

单选题A.Someassignmentsfornextweek.B.Somecourseproblems.C.Someplansforthefuturejob.D.Someproblemsaboutbooks.

单选题 Questions 19 to 22 are based on the conversation you have just heard.

单选题At post offices one buys stamps, leaves ______ letters, sends parcels or money orders, etc.

单选题We should adapt to the ______ of the society we live in.

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单选题The FTC report also highlighted the fact that toys based on are often marketed to young children.

单选题By saying that "in too many academic fields, the work has no context" ( Line 4, Para. 1 ) the author means that the teaching in these areas________.

单选题Volcanoes are the ultimate earth-moving machinery. Eruptions have rifted continents, raised mountain chains, constructed islands and shaped the topography of the earth. The entire ocean floor has a basement of volcanic basalt. Volcanoes have not only made the continents, they are also thought to have made the world"s first stable atmosphere and provided all the water for the oceans, rivers and ice-caps. There are now about 600 active volcanoes. Every year they add two or three cubic kilometers of rock to the continents. Imagine a similar number of volcanoes smoking away for the last 3,500 million years. That is enough rock to explain the continental crust. What comes out of volcanic craters is mostly gas. More than 90% of this gas is water vapor from the deep earth: enough to explain, over 3,500 million years, the water in the oceans. The rest of the gas is nitrogen, carbon dioxide, sulphur dioxide, methane, ammonia and hydrogen. The quantity of these gases, again multiplied over 3,500 million years, is enough to explain the mass of the world"s atmosphere. We are alive because volcanoes provided the soil, air and water we need. Geologists consider the earth as having a molten core, surrounded by a semi-molten mantle and a brittle, outer skin. It helps to think of a soft-boiled egg with a runny yolk, a firm but squishy white and a hard shell. If the shell is even slightly cracked during boiling, the white material bubbles out and sets like a tiny mountain chain over the crack—like an archipelago of volcanic islands such as the Hawaiian Islands. But the earth is so much bigger and the mantle below is so much hotter. Even though the mantle rocks are kept solid by overlying pressure, they can still slowly "flow" like thick treacle. The flow, thought to be in the form of convection currents, is powerful enough to fracture the "eggshell" of the crust into plates, and keep them bumping and grinding against each other, or even overlapping, at the rate of a few centimeters a year. These fracture zones, where the collisions occur, are where earthquakes happen. And, very often, volcanoes.

单选题AIDS is a global problem that demands a unified, worldwide solution, which is not only the responsibility of nations in which AIDS is most ______.

单选题 On the heels of E1 , its opposite, La may soon arrive. In a Weekly Update, scientists at the NOAA Climate Prediction Center reported that as the 2006-2007 E1 faded, surface and subsurface ocean temperatures have rapidly decreased. Recently, cooler-than-normal water temperatures have developed at the surface in the east-central equatorial Pacific, indicating a possible transition to La conditions. Typically, during the U.S. spring and summer months, La conditions do not significantly impact overall inland temperature and precipitation (雨水的降落) patterns, however, La episodes often do have an effect on Atlantic and Pacific hurricane activity. "Although other scientific factors affect the hurricanes, there tends to be a greater-than-nor-mal number of Atlantic hurricanes and fewer-than-normal number of eastern Pacific hurricanes during La events," said retired Navy Vice Adm. Conrad C. Lautenbacher, Ph.D., under secretary of commerce for oceans and atmosphere and NOAA administrator. "During the winter, usual La impacts include drier and warmer-than-average conditions over the southern United States." "NOAA's ability to detect and monitor the formation, duration and strength of E1 and La events is enhanced by continuous improvements in satellite and buoy observations in the equatorial Pacific," Lautenbacher added. "These observing systems include the TAO/TRITON moored and Argo drift buoys, as well as NOAA's polar orbiting satellites." La conditions occur when ocean surface temperatures in the central and east-central equatorial Pacific become cooler than normal. These changes affect tropical rainfall patterns and atmospheric winds over the Pacific Ocean, which influence the patterns of rainfall and temperatures in many areas worldwide. "La events sometimes follow on the heels of E1 conditions," said Vernon Kousky, research meteorologist at the NOAA Climate Prediction Center. "It is a naturally occurring phenomenon that can last up to three years. La episodes tend to develop during March-June, reach peak intensity during December-February, and then weaken during the following March-May." "The last lengthy La event was 1998-2001, which contributed to serious drought conditions in many sections of the western United States," said Douglas Lecomte, drought specialist at the NOAA Climate Prediction Center. NOAA will issue the U.S. Spring Outlook on March 15, and its Atlantic Hurricane Season Outlook in May. Both outlooks will reflect the most current La forecast. "While the status of E1 /La is of vital importance to our seasonal forecasts, it is but one measure we use when making actual temperature and precipitation forecasts," said Kousky.

单选题Environmentalists keep quiet because concern over the radioactive gaseous elements in houses would ______ attention from the campaign against nuclear power.

单选题In this passage the author really concerns ______.

单选题Questions 9 to 11 are based on the conversation you have just heard.

单选题Practically speaking, the artistic maturing of the cinema was the single-handed achievement of David W, Griffith (1875-1948). Before Griffith, photography in dramatic films consisted of little more than placing the actors before a stationary camera and showing them in full length as they would have appeared on stage. From the beginning of his career as a director, however, Griffith, because of his love of Victorian painting, employed composition. He conceived of the camera image as having afore-ground (近景) and a rear ground (远景),as well as the middle distance preferred by most directors. By 1910 he was using close-ups to reveal significant details of the scene or of the acting and extreme long shots to achieve a sense of spectacle and distance. His appreciation of the camera's possibilities produced novel dramatic effects. By splitting an event into fragments and recording each from the most suitable camera position, he could significantly vary the emphasis from camera shot to camera shot. Griffith also achieved dramatic effects by means of creative editing. By placing images close together and varying the speed and rhythm of their presentation, he could control the dramatic intensity of the events as the story progressed. Despite the reluctance of his producers, who feared that the public would not be able to follow a plot that was made up of such arranged images, Griffith persisted, and experimented as well with other elements of cinematic (电影的，影片的) arrangement that have become standard ever since. These included the flashback, permitting broad psychological and emotional exploration as well as narrative that were not in time order, and the crosscut between two parallel actions to heighten suspense and excitement. In thus exploiting fully the possibilities of editing, Griffith borrowed devices of the Victorian novel in film-making and gave film mastery of time as well as space. Besides developing the cinema's language, Griffith immensely broadened its range and treatment of subjects. His early output included not only the standard comedies, melodramas, westerns, and thrillers, but also adaptations from Browning and Tennyson, and treatments of social issues. As his successes mounted, his ambitions grew, and with them the whole of America cinema. When he remade Enoch Arden in 1911, he insisted that a subject of such importance could not be treated in the conventional length of one reel. Griffith's introduction of the American-made multireel picture began an immense revolution. Two years later, Judith of Bethulia, an elaborate historic-philosophical spectacle, reached the unprecedented length of four reels, or one hour's running time. From our contemporary viewpoint, the pretensions of this film may seem a trifle ridiculous, but at the time it provoked endless debate and discussion and gave a new intellectual respectability to the cinema.

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