阅读理解 We all know that certain oils are healthier than others,but your oil hea

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阅读理解    We all know that certain oils are healthier than others,but your oil health goes beyond just the type.
The health of your oil can be related to how you use it too.
     Each type of oil has what is called a "smoke point". The smoke point is the specific temperature at
which the oil starts to break down,or in more technical terms,its molecular structure begins to change.
These molecular changes result in changes in flavor,as well as changes in nutritional value-specifically,
the nutritional value of the oil starts to reduce,changing what once may have been considered an
especially healthy oil,like olive,into one that is unhealthy.
     The higher an oil"s smoke point is,the higher the temperature of the oil can be.As a result,each type
of oil should be used for the cooking method that is most appropriate to its individual smoke point and
heat tolerance.Here is a quick guide for the next time you reach for your favorite oil.

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Heat During Cooking	Oil	Best Use
Low to Moderate	Coconut Corn Olive Peanut Sesame Walnut	Baking (low heat)Light Sauting Pressure Cooking Salads
Medium Heat	Macadamia Nut Safflower	Baking Sauting StirFrying
High Heat	Grapeseed Sunflower Soybean/Soy	Deep Browning DeepFrying
1-4: DCBC
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Britain"s seed bank, the only one in the world aiming to collect all of the planet"s wild plant species, has reached its goal of banking 10 percent by 2010. The Millennium Seed Bank Project, run by Kew Gardens-one of the oldest botanical gardens-will officially deposit the 24,200th species on Thursday, a pink, wild banana from China. More than 50 countries are now on board with Kew"s giant task but vast places of the globe, including India and Brazil, still need to join in and donate seeds, director Paul Smith said. The seed bank is one of the largest and most diverse in the world with more than 1.5 billion seeds.Its goal is to help protect the planet"s biodiversity during a time of climate change. The wild banana seed is under threat of extinction (灭绝) in Southwest China from agricultural development.It is a vital food source for Asian elephants and important for growing bananas for human consumption. Stored at minus20 degrees centigrade, the seeds can last for thousands of years and await the day that scientists hope never comes-when the species no longer exist in the wild. It is a race against time, Smith said, because in the last decade alone, 20 plants held in the bank have already been wiped out in the wild.He estimates that between a third and a quarter will become extinct this century. "It is urgent and it is happening now.An area, the size of England, is cleared of primary vegetation (植被) every year." Smith said. Because most of the world"s food and medicines come from nature, protecting wild plant species is quite important, scientists say.There are already many other seed banks safeguarding food crops, which only account for 0.6 percent of plant diversity. For Kew"s next goal-to collect a quarter of wild varieties by 2020-the botanists need 10 million pounds a year, or a further 100 million pounds on top of the 40 million they have already been granted. 1. What"s the final purpose of the Britain"s seed bank? A. To collect enough money for the project. B. To safeguard food crops. C. To protect wild plants from extinction. D. To help scientists study wild plants. 2. The wild banana seed in China is in danger because of________. A. the expanding of farming work B. the climate change in this area C. the large number of Asian elephants D. human"s large consumption 3. We can learn from the passage that________. A. the seeds in the bank can be used now and then spread all over the world B. India and Brazil haven"t joined in the Seed Bank Project at present C. there is only one seed bank in the world at present D. the wild plants in places like India and China will never die out 4. What does the underlined word "It" in Paragraph 7 refer to? A. The extinction of plant species. B. The Millennium Seed Bank Project. C. Britain"s seed bank. D. Kew Gardens"next goal. 5. Which of the following information isn"t mentioned in the passage? A. The global partnership of collecting wild plant species. B. The temperature condition of the conservative wild plant species. C. The government"s financial support for the seed bank project. D. Scientists"concern on the extinct wild plant species.
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A. Why do people turn to alternative energy? B. How do we use renewable energy? C. The sources of renewable energy. D. What is renewable energy? E. Where is the solar energy from? F. The advantages of renewable energy.
1. When speaking about renewable energy, we are talking about power which derives its energy from resources which will not be diminished from the use. Renewable energy is a substitute for the nonrenewable energy of fossil fuel. 2. One fundamental advantage of renewable energy, and environmentalists" favorite reason to promote its use, is that there are no greenhouse gases or other pollutants give out as there are with the burning of fossil fuels. Renewable energy, or solar, water and wind power, are certainly not new although they have received much attention recently because they will not cause pollution. Environmental friendly power sources such as wind, solar and water power have been used in both developing and developed countries for a long time because they are cheap and clean, but they have yet to be used as a primary source of energy for any big urban area. 3. The generation of power from renewable energy sources has become somewhat more common in recent times as people have increasingly become aware of issues such as climate change due to fossil fuel byproducts and the political or social worries about nuclear power. There are numerous countries and nonprofit, environmentally conscious organizations that are supporting the use of renewable energy. 4. The flow of renewable energy has to do with naturally occurring phenomena. Tides, sunlight, wind and heat are all created by geothermal events and all are sources of energy has unique characteristics related to where and how we can use them. 5. Most technology which transforms renewable energy into power which we can use is solar power either directly or indirectly. The atmospheric system of the earth keeps balance so that the heat which spreads out into space is equal to the amount of radiation received from the sun. The quantity of energy contained in the atmosphere approximates the earth" s climate. The bodies of water of the earth, or its hydrosphere, absorb much of the radiation which is received from the sun. And much of that absorbed radiation is in the lower latitudes surrounding the equator.
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For the people living in the Nile Basin, the river is their life.This 6,825 km waterway, whose watershed (流域) covers three million square kilometers, flows through mountains, woodlands, lakes and deserts. Its potential for fishing, tourism and shipping is great-but so are its challenges. Water shortage, already serious in Egypt and Sudan, will soon influence several other countries in the watershed as well.Today, about 160 million people depend on the Nile River for their living. Within the next 25 years, the district"s population is expected to double, adding to the demand brought about by growth in industry and agriculture. The frequent drought (干旱) adds to the urgency. Water quality is also a problem. Precious soil is washed out to sea.Wastes from industry and agriculture create pollution. Higher concentrations of salt influence irrigated soils. Waterborne diseases continue unchecked. In areas where it"s hot and damp, water hyacinths choke off lakes, dams and other sections of the river, making it difficult for fishing and other businesses to move forward. Native people along the narrow area of farmland have watched the sand move closer day by day. They"ve seen the river change course, and their only source (来源) of water thickened with mud. They"re very poor and have few choices. But a new program, the Nile Basin Initiative (NBI), is offering very practical assistance. The program is more than just a watermanagement project. It"s a plan for the social and economic development of a vast district: it concentrates on the needs of the poorest of the poor and the environment that supports them. These are whole ecosystem problems, calling for united solutions (解决办法). Half the Nile Basin"s countries are among the world"s poorest nations; yet, somehow, they must find the resources, skills and political will to overcome these challenges.
1. What are the great challenges the Nile Basin faces?
A. The development of shipping industry. B. Overfishing of native people. C. Water shortage and water quality. D. Increasing population and tourism.
2. The underlined word "hyacinths" ( in Paragraph 3 ) refers to "_____".
A. animals B. plants C. rocks D. salts
3. The program NBI is mainly aimed at _____.
A. preventing water pollution B. changing the river course C. improving living conditions of the poor D. preventing land from becoming desert
4. What would be the best title of this passage?
A. People"s Life in Egypt and Sudan B. Frequent Drought in Egypt and Sudan C. The Poorest Countries in the Nile Basin D. The Ecosystem Problems in the Nile Basin
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The idea for a science experiment can come from an unusual place. After watching a YouTube video of a dancing bird named Snowball, a scientist in California decided to study the ability of animals to keep the beat. Bird lovers have long claimed that their pets have rhythm, and there are many videos of dancing birds online. Until now, scientists have suspected that humans are the only animals that can accurately keep rhythm with music. Thanks to Snowball, that scientific opinion is changing. Snowball is a cockatoo, a kind of parrot, and his favorite song is "Everybody" by the Backstreet Boys. When he hears the song, he moves his feet and rocks his body with the tempo, or pace of the music, as though he is the only bird member of the boy band. Aniruddh Patel is a neuroscientist, or a scientist who studies how the brain and the nervous system contribute to learning, seeing and other mental abilities. He works at the Neurosciences Institute in San Diego. After seeing Snowball" s dance online, Patel visited the cockatoo at the bird rescue facility he"s called home for two years. The scientist played "Everybody" for Snowball and also played versions of the song that were sped up or slowed down.Sometimes, Snowball danced too fast or too slowly. Often, when there was a change in tempo, Snowball adjusted his dancing to match the rhythm.In other experiments, scientists have observed the same abilities in preschool children. Patel isn"t the only scientist who has studied Snowball"s moves. Adena Schachner, who studies psychology at Harvard University, also wanted to know more about the dancing bird.Schachner"s team played different musical pieces for Snowball and a parrot named Alex, as well as eight human volunteers. The scientists observed that the birds and the humans kept time to the music with about the same accuracy. Schachner and her team watched thousands of YouTube videos of different animals moving to music. Not all the animals could dance, however.From watching the videos, the scientists observed that only animals that imitate sounds, including 14 parrot species and Asian elephants, accurately moved in time to music.
1. The underlined words "that scientific opinion" in the third paragraph refer to the theory that _____.
A. birds like Snowball have the ability to keep the beat B. humans are the only animals that can accurately keep rhythm with music C. the brain and the nervous system contribute to some mental abilities D. bird pets can have their special rhythm under human’s instruction
2. From the fourth paragraph we may know that _____.
A. Patel is the only scientist who has studied Snowball’s moves. B. Snowball is able to adjust his dancing to match the rhythm. C. Snowball cannot dance to the versions of the song Everybody. D. it is the brain and the nervous system that control the mental abilities.
3. The idea of studying animals" ability to keep the beat comes from _____.
A. bird lovers" discovery B. humans" musical sense C. the same abilities in children D. videos of dancing birds
4. According to the scientists, Snowball"s ability to dance to music is probably related to the fact that _____.
A. it is the only bird member of the Backstreet Boys band B. it has the ability to imitate sounds C. it is a kind of dancing parrot D. it has the same abilities as preschool children
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If, for some reason, you had 2,010 empty plastic bottles, what would you do? You"d probably sell them cheaply, right? But Xia Yu collected 2,010 bottles and built a boat with them. As you read this, Xia is, in fact, on a river somewhere in Anhui, slowly going towards his destination: the Expo Garden in Shanghai. 2,010 plastic bottles were to celebrate the Expo 2010 Shanghai. On the opening day of the Expo, Xia, together with five friends, went on a 1,500 km journey from Xiangtan to the Expo Garden, in spite of the doubt whether they"ll make it.After all, the boat they are on can hardly be called a boat. It cost only 2,000 yuan to build in a month. What"s keeping Xia going is a major cause behind the trip. "We are examining water pollution through our journey and trying to promote a lowcarbon lifestyle. Before we started, no one believed we could sail the boat to the Dongting Lake. But we made it." But as they expected, the journey has not always been smooth. Of the six from Xiangtan, four gave up. As of press time (截至发稿时), only Xia and his friend Huang Ying were on the boat.Huang suffered from a disease when they reached Jiujiang, Jiangxi Province.Xia said,"There are so many things that can stop us from making it to Shanghai, like the weather, health, and sometimes swift river water." "The boat was produced in a factory according to our design, and perhaps it"s not in a very good condition. But," Xia said, "we are wearing life jackets." "Some boats passing by offered help." What is more of a reward for Xia and Huang is that the Yangtze River turned out much cleaner than they had expected. Although Xia and Huang are uncertain about the journey ahead, they are "quite happy" with what they have already achieved. "After all, it"s not the destination that counts. It"s always the course that matters the most."
1. Xia Yu doubts the success of the journey because of _____.
A. such a long journey on the river B. the poor boat and the bad weather C. few people taking part in the journey D. the seriously polluted river in some parts
2. Which of the following is NOT the purpose of the journey?
A. To examine water pollution. B. To celebrate the Expo 2010 Shanghai. C. To win a race on the water. D. To promote a lowcarbon lifestyle.
3. From the text we know that _____.
A. they stay on the boat at night B. three people gave up due to their bad health C. Xia Yu and his mate have arrived in Shanghai D. Huang suffered from a disease on the journey
4. The last paragraph tells us Xia Yu and Huang Ying _____.
A. pay more attention to the process B. are sure to arrive at the destination C. helped turn the Yangtze River cleaner D. are happy because of their final success