单选题The price of vegetables {{U}}varies{{/U}} according to the weather.

单选题Forests for Cities You are standing in a beautiful forest in Japan. The air is clean and smells like plants and flowers. There are 175 different kinds of trees, and 60 kinds of birds live here. _______ (46) You are downtown in the city of Nara, Japan, in Kasugayama Forest, the oldest urban forest in the world. It was started more than a thousand years ago, and today it's very popular with tourists and artists. Cities around the world are working to protect their urban forests. Some urban forests are parks, and some are just streets with a lot of trees. But all urban forests have many good effects on the environment. _______ (47) They also stop the noise from heavy traffic. They even make the weather better because they make the air 3-5 degrees cooler, and they stop strong winds. Urban forests also have many good effects on people. They make the city more beautiful. In a crowded area, they give people a place to relax and spend time in nature. _____(48) In some countries, people are starting new urban forests. In England, there are now 1.3 million trees in an urban forest called Thames Chase, east of London. It was started in 1990, and it has grown very fast. Walking and bicycle clubs use the forest, and there are programs for children and artists. ____ (49) Some older cities don't have space for a big urban forest, but planting trees on the streets makes the city better. Scientists found that commuters (通勤人员) feel more relaxed when they can see trees. Trees are even good for business. _______ (50) In the future, urban forests will become even more important as our cities grow bigger. In the megacities(超大城市) of tomorrow, people will need more green space to live a comfortable life. Planting trees today will make our lives better in the future. A．People spend more time at shopping centers that have trees B．In hot countries，urban forests are cool places for walking and other healthy exercises C．But you are not in rural area D．Trees take pollution out of the air E．In 2033，it will have 5 million trees F．It has many kinds of birds in the country

单选题The Northern Lights The sun is stormy and has it own kind of weather. It is so hot and active that even the Sun's gravity cannot hold its atmosphere in cheek! Energy flows away from the Sun toward the Earth in a stream of electrified particles that move at speeds around a million miles per hour. These particles are called plasma, and the stream of plasma coming from the Sun is called the solar wind. The more active the Sun, the stronger the solar wind. The solar wind constantly streams toward the Earth, but don't worry because a protective magnetic fields surrounds our planet. The same magnetic field that makes your compass point north also steers the particles from the Sun to the north and south poles. The charged particles become trapped in magnetic belts around the Earth. When a large blast of solar wind crashes into the Earth's magnetic field first gets squeezed and then the magnetic field lines break and reconnect. The breaking and reconnecting of the magnetic field lines can cause atomic particles called electrons trapped in the belts to fall into the Earth's atmosphere at the poles. As the electrons fall into the Earth, they collide with gas molecules in the atmosphere, creating flashes of light in the sky. Each atmospheric gas glows a different color. Oxygen and nitrogen glows red and green and nitrogen glows violet-purple. As these various colors glow and dance in the night sky, they create the Northern Lights and the Southern Lights. Watching auroras is fun and exciting, but normally you can only see them in places far north like Alaska and Canada. The movement of the aurora across the sky is usually slow enough to easily follow with your eyes but they can also pulsate, flicker, or even move like waves. During solar maximum, auroras are seen as far south as Florida, even Mexico! Auroras often seem to be very close to the ground, but the lowest aurora is still about 100 kilometers above the ground, a distance much higher than clouds are formed or airplanes can fly. A typical aurora band can be thousands of kilometers long, a few hundred kilometers high, but only a few hundred meters thick. We hope you are able to travel to far-north places like the Arctic Circle and see the Northern Lights at least once during your lifetime. We know you will never forget it!

单选题What does Ghirardi say about algae?

单选题Officials estimate that the Fort Collins project will cost roughly $ 350 million. The stimulus money kicks in only $ 4.8 million, which leaves the city to do significant fundraising. Money could come from a mix of government, private investments, utility companies, and research and development grants. "It's a ton of money and there's no way we can do this on our own, "says Mike Freeman, Fort Collins's chief financial officer and economic-development guru (专家). "The biggest risk for us is that we won't have enough money and that this will take 20 years." Fort Collins project call possibly get financial support from all the following source EXCEPTA. government.B. personal investments.C. financial institutions.D. research and development grants.

单选题She exhibited great powers of endurance during the climb.

单选题{{B}}第二篇{{/B}} {{B}}Eiffel Is an Eyeful{{/B}} Some 300 meters up, near the Eiffel Tower's wind-whipped summit the world comes to scribble. Japanese, Brazilians, Americans they graffiti their names, loves and politics on the cold iron -- transforming the most French of monuments into symbol of a world on the move. With Paris laid out in miniature below, it seems strange that visitors would rather waste time marking their presence than admire the view. But the graffiti also raises a question: Why, nearly 114 years after it was completed, and decades after it ceased to be the world's tallest structure, is la Tour Eiffel still so popular? The reasons are as complex as the iron work that graces a structure some 90 stories high. But part of the answer is, no doubt, its agelessness. Regularly maintained, it should never rust away. Graffiti is regularly painted over, but the tower lives on. "Eiffel represents Paris and Paris is France. It Is very symbolic," says Hugues Richard, a 31-year-old Frenchman who holds the record for cycling up to the tower's second floor -- 747 steps in 19 minutes and 4 seconds, without touching the floor with his feet. "It's iron lady, it inspires us," he says. But to what? After all, the tower doesn't have a purpose. It ceased to be the world's tallest in 1930 when the Chrysler Building went up in New York. Yes, television and radio signals are beamed from the top, and Gustave Eiffel, a frenetic builder who died on December 27, aged 91, used its height for conducting research into weather, aerodynamics and radio communication. But in essence the tower inspires simply by being there -- a blank canvas for visitors to make of it what they will. To the technically minded, it's an engineering triumph. For lovers, it's romantic. "The tower will outlast all of us, and by a long way," says Isabelle Esnous, whose company manages Eiffel Tower.

单选题Their interpretation was faulty .

单选题Very few people are prepared to Usacrifice/U their own comfort for the good of other people.

单选题Microchip Research Center Created A research center has been 1 in this Far Eastern country to develop advanced microchip production technology. The center, which will start out with about US $14 million, will help the country develop its chip industry without always depending on imported technology. The center will make use of its research skills and 2 to develop new technology for 3 chip plants. The advent of the center will possibly free the country from the 4 that it is always buying almost-outdated technologies from other countries, said the country"s flagship chipmaker. 5 , chip plants in this country are in a passive situation because many foreign governments don"t allow them to 6 the most advanced technologies, fearing they will be used for 7 purposes. Moreover, the high licensing fees they have to pay to technology providers are also an important 8 for their decision of self-reliance. As mainstream chip production technology 9 from one generation to the next every three to five years, plants with new technology can make more powerful chips at lower costs, while plants with 10 equipment, which often cost billions of dollars to build, will be 11 by the maker. More than 10 chip plants are being built, each costing millions of US dollars. The majority of that money goes to overseas equipment 12 and technology owners—mainly 13 Japan and Singapore. Should the new center play a major role in improving the situation in the industry, the country admits the US $14 million investment is still rather small. This country is developing 14 technologies. Most of the investment will be spent on setting 15 with technology and intellectual property owners.

单选题1. The Internet Don't we find it irresistible? The Internet is everywhere, and it is loved and used by everyone for everything. A quick survey reveals that most people will tell you that they use the Internet to stay in touch with others on the Internet. Most of us say that writing or receiving e-mail is our" number One use of the Internet. We do this at home, at work, or wherever we sit down at a computer. We send and receive e-mails for fun, for personal reason, daily for business, and in all areas of our work. The Internet allows us to communicate from room to room, city to city, or country to country for the same price and the same immediate speed. Correspondence is king of Internet use. As students, we use the Internet to do research and help us with our assignments. Friends or teachers often suggest we look up an article on the web. We act on those suggestions nearly as frequently as we write e-mails. We love the ability to grab quick chunks of information and make it ours. As students, we no longer have to search through dusty books and spend money, copying articles to get our research done. This unique research tool is available twenty-four hours a day, every day of the week, or as long as have electricity or a form of power to get us online. For those of us who have watched travel agencies close up their doors and go out of business, we know that online travel is the future, and the future has arrived. Wherever we want to go and however we want to get there, the Internet is our guide and companion to those destinations. The Internet has changed the way we travel forever. Go online with a credit card in hand, and you can arrange for hotel in Dallas, a rental car in Los Angeles, or a safari in Kenya. Electronic commerce or e-commerce is one of the fastest growing areas of Internet use. Ecommerce is the buying and selling of either services or merchandise while using the Internet. Buying cars, sending musical greeting cards, downloading the newest music, and even trading stocks are done everyday on the Interact before some of us see the sun rise. Just imagine how many millions and millions of dollars have changed due to commercial activities since you started reading this.

单选题The depiction of the lives of black people in the south is graphic .

单选题In fine days, you"d better open windows to ventilate the room.

单选题Her regular primary care doctor Uset aside/U her complaints with a smile.

单选题Our statistics show that we consume all that we are capable of producing.

单选题People fishing on a lake must wait calmly so as not to scare the fish away.

单选题I want to provide my boys with a decent education.

单选题{{B}}第三篇{{/B}} {{B}}Underground Coal Fires -- a Looming Catastrophe{{/B}} Coal burning deep underground in China, India and Indonesia is threatening the environment and human life, scientists have warned. These large-scale underground blazes cause the ground temperature to heat up and kill surrounding vegetation, produce greenhouse gases and can even ignite forest fires, a panel of scientists told the annual meeting of the American Association for the Advancement of Science in Denver. The resulting release of poisonous elements like arsenic and mercury can also pollute local water sources and soils, they warned. "Coal fires are a global catastrophe," said Associate Professor Glenn Stracher of East Georgia College in Swainsboro, USA. But surprisingly few people know about them. Coal can heat up on its own, and eventually catch fire and burn, if there is a continuous oxygen supply. The heat produced is not caused to disappear and under the right combinations of sunlight and oxygen, can trigger spontaneous catching fire and burning. This can occur underground, in coal stockpiles, abandoned mines or even as coal is transported. Such fires in China consume up to 200 million tones of coal per year, delegates were told. In comparison, the U.S. economy consumes about one billion tones of coal annually, said Stracher, whose analysis of the likely impact of coal fires has been accepted for publication in the International Journal of Coal Ecology. Once underway, coal fires can bum for decades, even centuries. In the process, they release large volumes of greenhouse gases, poisonous fumes and black particles into the atmosphere. The members of the panel discussed the impact these fires may be having on global and regional climate change, and agreed that the underground nature of the fires makes them difficult to detect. One of the members of the panel, Assistant Professor Paul Van Dijk of the International Institute for Geo-Information Science and Earth Observation in the Netherlands, has been working with the Chinese government to detect and monitor fires in the northern regions of the country. Ultimately, the remote sensing and other techniques should allow scientists to estimate how much carbon dioxide these fires are emitting. One suggested method of containing the fires was presented by Gary Colaizzi, of the engineering firm Goodson, which has developed a heat-resistant grout (a thin mortar used to fill cracks and crevices), which is designed to be pumped into the coal fire to cut off the oxygen supply.

单选题Even the best-build machine will not run forever without proper maintenance.A. eternallyB. smoothlyC. dependablyD. accurately

单选题It can be inferred that the writer thinks that engineering curricula are