单选题Through her portrayal of eight college-educated women in the book, The Group, author Mary McCarthy criticizes an entire period. A. age B. nation C. social class D. system of education

单选题Althouse Bus Company pays much attention to

单选题 How the First Stars in the Universe Came into Existence How the first stars formed from this dust and gas has been a burning question for years, but a state-of-the- art computer simulation now offers the most detailed picture yet of how these first stars in the universe came into existence, researchers say. The composition of the early universe was quite different from that of today, and the physics that governed the early universe were also somewhat simpler. Dr. Naoki Yoshida and colleagues in Japan and the U.S. incorporated these conditions of the early universe, sometimes referred to as the "cosmic dark ages, " to simulate the formation of an astronomical object that would eventually shine its light into this darkness. The result is a detailed description of the formation of a protostar-the early stage of a massive primordial star of our universe, and the researchers' computer simulation, which has been called a "cosmic Rosetta Stone." sets the bar for further investigation into the star formation process. The question of how the first stars evolved is so important because their formations and eventual explosions provided the seeds for subsequent stars to come into being. According to their simulation, gravity acted on minute density variations in matter, gases, and the mysterious "dark matter" of the universe after the Big Bang in order to form this early stage of a star-a protostar with a mass of just one percent of our sun. The simulation reveals how pre-stellar gases would have actually evolved under the simpler physics of the early universe to form this protostar. Dr. Yoshida's simulation also shows that the protostar would likely evolve into a massive star capable of synthesizing heavy elements, not just in later generations of stars, but soon after the Big Bang. "This geneal picture of star formation, and the ability to compare how stellar objects form in different time periods and regions of the universe, will eventually allow investigation into the originsof life and planets, " said Lars Hernquist, a Professor of Astronomy at Harvard University and a coauthor of this latest report. "The abundance of elements in the universe has increased as stars have accumulated, " he says, "and the formation and destruction of stars continues to spread these elements further across the universe. So when you think about it, all of the elements in our bodies originally formed from nuclear reactions in the centers of stars, long ago." Their simulation of the birth of a protostar in the early universe signifies a key step toward the ambitious goal of piecing together the formation of an entire primordial star and of predicting the mass and properties of these first stars of the universe. More powerful computers, more physical data, and an even larger range will be needed for further calculations and simulations, but these researchers hope to eventually extend this simulation to the point of nuclear reaction initiation--when a stellar object becomes a true star. "Dr. Yoshida has taken the study of primordial star formation to a new level with this simulation, but it still gets us only to the halfway point towards our final goal. It is like laying the foundation of a skyscraper, " said Volker Bromm, Assistant Professor of Astronomy at the University of Texas, Austin and the author of a companion article. "We must continue our studies in this area to understand how the initially tiny protostar grows, layer by layer, to eventually form a massive star. Buthere, the physics become much more complicated and even more computational resources are needed."

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 (诵读困难). 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Which of the following is NOT true of Hurricane Katrina according to the last paragraph?

单选题With the help of the space-shuttle-carried radar, archeologists found

单选题More than 89 percent of the buildings in Annapolis, Maryland, were erected before the Revolutionary War.

单选题Several people were missing during the storm.

单选题Help Your Child Become a Reader Encouraging early reading skills can build a path to a lifelong (终身的) love of reading and can help your child get a head start in school. While reading to your child is still the most important thing you can do to build reading skills, there are many techniques that can help. Make reading fun. Play games with your child as you read. Many traditional children's games can be adapted to encourage reading skills. While reading or during play, tell your child, "I spy with my little eye, something that begins with the letter b. "Help the child find something on the page or in the room that begins with that letter. For example. "I see a barn. "This can also be used to teach beginning letter sounds. "I spy with my little eye, something that begins with the sound 's'. "Help the child find a word that begins with the "s" sound. In this variation on the popular game, instruct the child that, "Simon says, 'point to something that starts with the letter n. ' "The child can then find an object in the room or a body part, such as the nose, that starts with the letter presented. This can also be used to teach beginning sounds. Make a game out of rhyming (押韵) words by making up silly words to rhyme with the child's name of favorite toys. This sets the stage for rhyming real words by showing the child the similarities of sounds. As the child masters making up the words, begin rhyming real words to one another. Tips to raise a successful reader: Put books in places where the child plays. If books are easily accessible, children are more likely to pick them up. Let children "read to you" by looking at pictures. Making up stories to go along with illustrations helps children discover how words relate to pictures. Take books along on trips or even short visits to the doctor's office or grocery store. Have children help you shop. Reading grocery lists and looking for specific items helps build sight vocabulary.

单选题Nuclear Energy Nuclear energy is an efficient and convenient substitute for conventional forms of energy which were found in special geographical locations. Large amounts of (51) and effort are required to (52) these locations. Once the sites are found, men and equipment must be brought to tap and use these sources of energy. However, a large proportion of such sites are found only in far and (53) places. This increases the difficulties of (54) these forms of energy. With nuclear energy, such difficulties are not present. Nuclear reactors can easily be built anywhere, and man does not have to compete with the (55) of nature in order to obtain the energy. For equal amounts of energy, nuclear energy is much more convenient and inexpensive to obtain than conventional sources of energy. With nuclear energy, the amount of pollution is greatly reduced. (56) the production of nuclear energy is based on the fission (裂变)of atoms, pollution is kept to a very low level. The energy produced in the reactors is converted into heat and electricity, and these have (57) or no pollution at all. Conventional forms of fuel, (58) , produce large amounts of pollution. Production of nuclear energy uses the (59) of the fission of atoms; thus, (60) amounts of energy can be obtained from it. The world's reserves of oil, coal and natural gas are running (61) at a tremendous rate and current estimates predict that (62) of the 21st century, most of these conventional fuels will be used up. Nuclear energy is the exception (63) this gloomy prediction. Through splitting and fusing atoms, large amounts of energy can be produced, and (64) this process can go on and on until all our energy needs are satisfied. The (65) of nuclear energy as boundless source of energy is indeed great, and we must harness it whenever possible as conventional fuels will not be around much longer.

单选题The earthquake that hit the eastern half of the United States two centuries ago is the biggest "mid-plate" one in history.

单选题From all the different clues, we were able to Udeduce/U that the murderer was a short fat woman.

单选题I Unotified/U him that the meeting had been postponed.

单选题That player is eternally arguing with the referee.

单选题Her display of bad temper completely ruined the party.

单选题A lot of people could fall ill after drinking contaminated water.

单选题My grandfather would sit for hours Uon end/U staring out of the window at the mountains.

单选题We"ve been through some rough times together.

单选题Laser beams can be used to bore metals and other hard materials.

单选题第二篇 The Book of Life So far, scientists have named about 1.8 million living species (物种), and that's just a small part of what probably exists on Earth. With so many plants, animals, and other creatures covering the planet, it can be tough to figure out what type of spider is moving up your leg or what kind of bird is flying by. A soon-to-be-launched Web site might help. An international team of researchers has announced the creation of a Web-based Encyclopedia (百科全书) of Life (EoL). The project aims to catalog every species on Earth in a single, easy-to-use reference guide. To get the encyclopedia started, the creators will use information from scientific databases (数据库) that already exist. And eventually, in special sections of the site, non-scientists with specialized (专门的) knowledge will get to join in. Bird-watchers, for example, will be able to input which birds they've seen and where. The technology for this kind of tool has only recently become available. As the EoL develops, you might find it useful for school projects. The site will feature special pages for kids who are studying ecosystems (生态系统) in their neighborhoods. To make sure the encyclopedia is accurate, scientists will review much of the information added to it. People who visit the site will be able to choose to leave out pages that haven't been reviewed. Another convenient feature of the EoL is that you'll be able to pick the level of detail you see to match your interests, age, and current knowledge. If you wanted to learn about bears for a science class report, for example, you could use the "novice" setting to get basic information about the animals. On the "expert" setting, on the other hand, you could get much more detailed information about the history, literature, and exploration of bears. It now takes years for scientists to collect all the data they need to describe and analyze species. The creators of the Encyclopedia of Life hope that their new tool will speed that process.