单选题His health had Udeteriorated/U while he was in prison.

单选题The change in that village was miraculous. A．conservative B．amazing C．insignificant D．unforgettable

单选题We should never satisfy ourselves with what we have learnedA. convinceB. contentC. comfortD. benefit

单选题Is English a compulsory subject in primary schools?

单选题Whether people in recent times have become more protective of their personal space is hard to say. Yet studies of airlines show passengers strong desire to have some space to themselves. In a recent survey from Trip Advisor, travelers said if they had to pay for certain benefits, they would rather have larger seats and more legroom than extra food. Scholars know that commuters hold newspapers in front of them to read, but also to shield themselves from strangers. They know that college students unconsciously sit at positions where they can avoid direct eye contact. "If you videotape people at a library, it's very clear what scat people will take," said Professor Dane Archer. One of the comer seats will go first ,followed by the chair diagonally (斜对角) opposite because that is the farthest away. "If you break those rules, it's fascinating, "Archer added, "People will pile up books as if to make a wall." If someone sits too close to you in the library, you will pile up books in front of" you so as toA. hide your awkwardness.B. show indifference to the person.C. protect your personal space.D. give the person an angry look.

单选题Bats, tortoises, snakes, frogs, even insects like butterflies, hibernate more or less completely. Some, like the squirrels, sleep during coldest weather but are aroused by a warm spell. During hibernation, the temperature of an animal's body drops drastically. Breathing and heart-beats almost cease. Another instinctive method of avoiding intense cold is to escape by means of migration. Wild swans, seagulls, swallows and cuckoos are a few of the very many kinds of birds which fly thousands of miles, twice a year, to avoid cold. Many animals, especially those of the Arctic reindeer of Europe, move southward towards the forests when winter approaches. They return to the northern area when the warmth of spring begins to be sensed. Arctic reindeers of Europe avoid the severe cold in winter byA. hibernation.B. migration.C. staying in a" secret place".D. growing thick fur.

单选题 Forecasting Methods There are several different methods that can be used to create a forecast. The method forecaster chooses depends upon the experience of the forecaster, the amount of information available to the forecaster, the level of difficulty that the forecast situation presents, and the degree of accuracy or confidence needed in the forecast. The first of these methods is the persistence method; the simplest way of producing a forecast. The persistence method assumes that the conditions at the time of the forecast will not change. For example, if it is sunny and 87 degree today, the persistence method predicts that it will be sunny and 87 degree tomorrow. If two inches of rain fell today, the persistence method would predict two inches of rain for tomorrow. However, if weather conditions change significantly from day to day, the persistence method usually breaks down and is not the best forecasting method to use. The trends method involves determining the speed and direction of movement for fronts, high and low pressure centers, and areas of clouds and precipitation. Using this information, the forecaster can predict where he or she expects those features to be at some future time. For example, if a storm system is 1,000 miles west of your location and moving to the east at 250 miles per day, suing the trends method you would predict it to arrive in your area in 4,days. The trends method works well when systems continue to move at the same speed in the same direction for a long period of time. If they slow down, speed up, change intensity, or change direction, the trends forecast will probably not work as well. The climatology method is another simple way of producing a forecast. This method involves averaging weather statistics accumulated over many years to make the forecast. For example, if you were using the climatology method to predict the weather for New York City on July 4th, you would go through all the weather data that has been recorded for every July 4th and take an average. The climatology method only works well when the weather pattern is similar to that expected for the chosen time of year. If the pattern is quite unusual for the given time of year, the climatology method will often fail. The analog method is a slightly more complicated method of producing a forecast. It involves examining today's forecast scenario and remembering a day in the past when the weather scenario looked very similar (an analog). The forecaster would predict that the weather in this forecast will behave the same as it did in the past. The analog method is difficult to use because it is virtually impossible to find a predict analog. Various weather features rarely align themselves in the same locations they were in the previous time. Even small differences between the current time and the analog can lead to very different results.

单选题Data from Voyager II have presented astronomers with a {{U}}puzzle{{/U}} about why our outermost planet exists.

单选题We tried to {{U}}restrict{{/U}} our conversation to arguments relevant to the topic. A. put B. suit C. confine D. resort

单选题A Small Event One afternoon in January 1989, Suzan Sharp, 43, and her 8-year-old son, David ,were walking hard across an icy parking lot, when Suzan''s cane (手杖)slid on the ice . She 【51】 face fist into the mud . David 【52】 to her side . "Are you all right, Mom?" 【53】 , Suzan put herself up. "I''m okay, honey." she said. It had been nearly two years since Suzan had trouble walking. She was falling more 【54】 now. Every inch of ice was a 【55】 danger for her. " I could do something," the boy thought. David, too, was having 【56】 of his own. The boy had a speech defect. At school he 【57】 asked questions or read aloud. One day Davids teacher announced a 【58】 assignment. "Each of you is going to come up with an invention, "she said. This was for "INVENT AMERICA!", a national competition to encourage creativity in 【59】 . An idea hit David one evening. 【60】 only his mothers cane didn’t slip on ice ,he thought. "That''s it!" David realized. "What if I fixed your cane to a nail stretched out of the bottom?" he asked his mother. His mother told him," 【61】 it would scratch floors. " "It looks like a ball-point pen. You take your hand 【62】 the button and the nail returns back up." Hours later the cane was finished. David and his father, Jeff, 【63】 as Suzan used it to walk 50 feet across the 【64】 . "It works!" she said . In July 1989, David was declared national winner at the annual" INVENT AMERICA!" ceremony in Washington D.C.. As David began to make 【65】 appearances, he was forced to communicate more clearly. Today, David is nearly free of his cane which is waiting to be widely used. So the boy who once had trouble talking now hopes to start making canes for people who have trouble walking.

单选题I won"t tolerate that kind of behavior.

单选题Sometimes it is advisable to book hotels in advance.

单选题The curious looks from the strangers around her made her feel uneasy .

单选题{{B}}第三篇{{/B}} {{B}}Snow Ranger{{/B}} The two things — snow and mountains — which are' needed for a ski area are the two things that cause avalanches, large mass of snow and ice crashing' down the side of a mountain — often called "White Death." It was file threat of the avalanche and its record as a killer of man in the western mountains that created the snow ranger. He first started on avalanche control work in the winter of 1937 — 1938 at Alta, Utah, in Wasatch National Forest. This mountain valley was becoming well known to skiers. It was dangerous. In fact, more than 120 persons had lost their lives in 1936 and another 200 died in 1937 as a result of avalanches before it became a major ski area. Thus, development of Alta and other major ski resorts in the west was dependent uponcontrolling the avalanche. The Forest Service set out to do it, and did, with its corps of snow rangers. It takes many things to make a snow ranger. The snow ranger must be in excellent physical condition. He must be a good skier and a skilled mountain climber. He should have at least a high school education, and the more college courses in geology, physics, and related fields he has, the better. He studies snow, terrain, wind, and weather. He learns the conditions that produce avalanches. He learns to forecast avalanches and to bring them roaring on down the mountainsides to reduce their killing strength. The snow ranger learns to do this by using artillery, by blasting with TNT, and by the difficult and skillful art of skiing avalanches down. The snow ranger, dressed in a green parka which has a bright yellow shoulder patch, means safety for people on ski slopes. He pulls the trigger on a 75 mm. Recoilless rifle, skis waist deep in powder testing snow stability, or talks with the ski area's operator as he goes about his work to protect the public from the hazards of deep snow on steep mountain slopes.

单选题Major earthquakes are among nature's most devastating (破坏性的) events, causing an incalculable loss of life and property.A. unmentionableB. unprofitableC. impossibleD. immeasurable

单选题A central objective of the developed country was to alleviate the problems of the urban poor.A. lessenB. identifyC. overcomeD. regulate

单选题Please Fasten Your Seatbelts Severe turbulence (湍流) can kill aircraft passengers. Now, in test flights over the Rocky Mountains, NASA．(美国航空航天局) engineers have successfully detected clear-air turbulence up to 10 seconds before an aircraft hits it. Clear-air turbulence often catches pilots by surprise. Invisible to radar, it is difficult to forecast and can hurl (用力抛出去) passengers about the cabin. In December 1997, one passenger died and a hundred others were injured when unexpected rough air caused a United Airlines flight over the Pacific to drop 300 metres in a few seconds. However, passengers can avoid serious injury by fastening their seatbelts. "It is the only antidote (对策) for this sort of thing," says Rod Bogue, project manager at NASA's Dryden Flight Research Center in Edwards, California. The centre's new turbulence detector is based on lidar, or laser radar. Laser pulses are sent ahead of the plane and these are then reflected back by particles in the air. The technique depends on the Doppler effect. The wavelength of the light shifts according to the speed at which the particles are approaching. In calm air, the speed equals the plane's airspeed. But as the particles swirl (打漩) in rough air, their speed of approach increases or decreases rapidly. The rate of change in speed corresponds to the severity (激烈程度) of the turbulence. In a series of tests that began last month, a research jet flew repeatedly into disturbed air over the mountain ridges (山脉) near Pueblo, Colorado. The lidar detector spotted turbulence between 3 and 8 kilometres ahead, and its forecasts of strength and duration corresponded closely with the turbulence that the plane encountered. Bogue says that he had "a comfortable amount of time" to fasten his seatbelt. The researchers are planning to improve the lidar's range with a more powerful beam. The system could be installed on commercial aircraft in the next few years.

单选题There is enough space for me to put my new furniture in the roomA. placeB. windowC. roomD. area

单选题It is laid down in the regulations that all members must carry their membership cards at all times. A．suggested B．warned C．stated D．described

单选题The water in this part of the river has been contaminated by sewage (污水).