单选题Snow Ranger 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 crushing down the side of a mountain, often called "White Death." It was the 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, 38 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 upon controlling 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The megaphone makes the voice sound louder because it points sound waves in one direction and keeps them from {{U}}spreading out{{/U}} in all directions.

单选题There are {{U}}various{{/U}} kinds of food in China.

单选题The army launched several air {{U}}raids{{/U}} yesterday morning.

单选题The committee was asked to Urender/U a report on the housing situation .

单选题Your dog needs at least 20 minutes of vigorous exercise every day.

单选题He emphasized a feasible plan which can be accepted by the both sides. A. favorable B. possible C. formal D. genuine

单选题From my standpoint , you know, this thing is just funny.

单选题According to the last paragraph，which of the following statements is NOT true?

单选题It seems that only Mary is eligible for the job. A. prepared B. trained C. qualified D. guided

单选题 Lateral Thinking Lateral thinking (迂回思维), first described by Edward de Bono in 1967, is just a few years older than Edward’s son. You might imagine that Caspar was raised to be an adventurous thinker, but de Bono name was so famous, Casper’s parents worried that any time he would say something bright at school, his teachers might snap, “Where do you get that idea from?” “We had to be careful and not overdo it,” Edward admits. Now Casper is at Oxford —— which once looked unlikely because he is also slightly dyslexic (通读困难). In fact, when he was applying to Oxford, none of his school teachers thought he had a chance. “So then we did several thinking sessions,” his father says, “using my techniques and, when he went up for the exam, he did extremely well.” Soon after, Edward de Bono decided to write his latest book, “Teach Your Children How to Think”, in which he transforms the thinking skills he developed for brain-storming businessmen into informal exercises for parents and children to share. Thinking is traditionally regarded as something executed in a logical sequence, and everybody knows that children aren’t very logical. So isn’t it an uphill battle, trying to teach them to think? “You know,” Edward de Bono says, “if you examine people’s thinking, it is quite unusual to find faults of logic. But the faults of perception are huge! Often we think ineffectively because we take too limited a view.” “Teach Your Child How to Think” offers lessons in perception improvement, of clearly seeing the implications of something you are saying and of exploring the alternatives.

单选题I'd like to report a Utheft/U: someone has stolen my bicycle.

单选题Recent discoveries in Montana indicate that some dinosaurs may have resided in colonies. A. lived B. died C. hunted D. fed

单选题Another good title for this passage would be

单选题They'd paid a substantial bribe to the surgeon in Rio. A. meager B. stern C. subtle D. steep

单选题 下面的短文有15处空白，请根据短文内容为每处空白确定1个最佳选项。 No Jetlag(时差反应) Anymore Most people who travel long distances complain of jetlag(时差反应). Jetlag makes business travelers less productive (对产的，有成效的) and more prone {{U}}(51) {{/U}} making mistakes. It is actually caused by {{U}}(52) {{/U}} of your "body clock"-a small cluster(串、组、群)of brain cells that controls the timing of biological {{U}}(53) {{/U}}. The body clock is designed for a regular rhythm(节奏)of daylight and darkness, so that it is thrown out of balance when it experiences daylight and darkness at the "wrong" times in a new time zone. The {{U}}(54) {{/U}} of jetlag often persist(持续) for days {{U}}(55) {{/U}} the internal body clock slowly adjusts to the new time zone. Now a new anti-jetlag system is available that is based on proven, {{U}}(56) {{/U}} and pioneering scientific research. Dr. Martin Moore has devised a practical strategy to adjust the body clock much sooner to the new time zone {{U}}(57) {{/U}} controlled exposure to bright light. The time zone shift(转换) is easy to accomplish and eliminates (消除) {{U}}(58) {{/U}} of the discomfort of jetlag. A successful time zone shift depends on knowing the exact times to either {{U}}(59) {{/U}} or avoid bright light. Exposure to light at the wrong time can actually make jetlag worse. The proper schedule {{U}}(60) {{/U}} light exposure depends a great deal on {{U}}(61) {{/U}} travel plans. Data on a specific flight itinerary (旅行路线) and the individual's sleep {{U}}(62) {{/U}} are used to produce a trip guide with {{U}}(63) {{/U}} on exactly when to be exposed to bright light. When the trip guide calls {{U}}(64) {{/U}} bright light you should spend time outdoors if possible. If it is dark outside, or the weather is bad, {{U}}(65) {{/U}} you are on an air plane, you can use a special light device to provide the necessary light stimulus(刺激) for a range of activities such as reading, watching TV or working.

单选题The carts are painted to correspond to the themed area they are used in. A. march with B. combine with C. standardize D. coordinate with

单选题Earthquake How does an earthquake start? What makes an earthquake happen? The rock of the earth"s crust (地壳) may have a fault, a kind of break in the surface. The blocks which make up the earth move, and sometimes this may cause the sides of the fault to move up and down or lengthways (纵向地) against each other. When one piece of rock starts to rub on another with great force, a lot of energy is used. This energy is changed into vibrations (振动) and it is these vibrations that we reef as an earthquake. The vibrations can travel thousands of kilometers and so an earthquake in Turkey may be felt in Greece. What to do during an earthquake? At school As soon as the earthquake starts, students should get under the desks immediately and wait until the teacher tells them it is safe to come out. The teacher should, at the same time, go immediately to the teacher"s desk, get underneath (在……下面) it and stay there till the danger is over. Students must not argue with the teacher or question instructions. As soon as the tremors (震动) stop, all students should walk towards the exit and go straight to the school playground or any open space such as a square or a park. They must wait there until the teacher tells them it is safe to go. At home If you are at home when the earthquake occurs, get immediately under the table in the living room or kitchen. Choose the biggest and strongest table you can find. You must not go anywhere near the window and don"t go out onto the balcony (阳台). Once the tremors have stopped, you can come out from under the table but you must leave the building straight away. You should walk down the stairs and should not use the lift-there may be a power cut as a result of the earthquake and you could find yourself trapped inside the lift for hours. In the street If you are in the street when the earthquake takes place, do not stand near buildings, fences or walls--move away as quickly as possible and try to find a large open space to wait in. Standing under trees could also be dangerous.

单选题The child's abnormal behavior puzzled the doctor. A. bad B. frightening C. repeated D. unusual

单选题Putting Plants to Work Using the power of the sun is nothing new. People have had solar-powered calculators and buildings with solar panels for decades. But plants are the real experts: They've been using sunlight as an energy source for billions of years. Ceils in the green leaves of plants work like tiny factories to convert sunlight, carbon dioxide, and water into sugars and starches, stored energy that the plants can use. This conversion process is called photosynthesis. Unfortunately, unless you're a plant, it's difficult and expensive to convert sunlight into storable energy. That's why scientists are taking a closer look at exactly how plants do it. Some scientists are trying to get plants, or biological cells that act like plants, to work as miniature photosynthetic power stations. For example, Mafia Ghirardi of the National Renewable Energy Laboratory in Golden, Colo., is working with green algae. She's trying to trick them into producing hydrogen instead of sugars when they perform photosynthesis. Once the researchers can get the algae working efficiently, the hydrogen that they produce could be used to power fuel cells in cars or to generate electricity. The algae are grown in narrow-necked glass bottles to produce hydrogen in the lab during photosynthesis, plants normally make sugars or starches. "But under certain conditions, a lot of algae are able to use the sunlight energy not to store starch, but to make hydrogen." Ghirardi says. For example, algae will produce hydrogen in an air free environment. It's the oxygen in the air that prevents algae from making hydrogen most of the time. Working in an air free environment, however, is difficult. It's not a practical way to produce cheap energy. But Ghirardi and her colleagues have discovered that by removing a chemical called sulfate from the environment that the algae grow in, they will make hydrogen instead of sugars, even when air is present. Unfortunately, removing the sulfate also makes the algae's cells work very slowly, and not much hydrogen is produced. Still, the researchers see this as a first step in their goal to produce hydrogen efficiently from algae. With more work, they may be able to speed the cells' activity and produce larger quantities of hydrogen. The researchers hope that algae will one day be an easy-to-use fuel source. The organisms are cheap to get and to feed, Ghirardi says, and they can grow almost anywhere: "You can grow them in a reactor, in a pond You can grow them in the ocean. There's a lot of flexibility in how you can use these organisms. /