单选题Goethe often did outdoor skating and swimming.

单选题We ascribe his great success to his intelligence and persistence.A. distributeB. attributeC. contributeD. subject

单选题The procedures were perceived as complex and less {{U}}transparent{{/U}}.

单选题Learn about Light 1 Ancient civilizations were amazed by the existence of light for thousands of years. The Greek philosophers believed that light was made up of countless, tiny particles that enter the human eye and create what we call vision. However, Empedocles and a Dutch scientist named Christian Huygens believed that light was like a wave. According to them, light spread out and travelled like a straight line. This theory was accepted during the 19th century. 2 ln 1905, Albert Einstein published a research paper in which he explained what is referred to as the photoelectric effect. This theory explains that particles make up light. The particles Einstein was referring to are weightless bundles（束）of electromagnetic（电磁）energy called photons（光子）. Today, scientists agree that light has a dual（二重） nature — it is part particle and part wave. It is a form of energy that allows us to see things around us. 3 Things that give off light are known as sources of light. During the day, the primary source of light is the sun. Other sources of light include stars, flames, flashlights, street lamps and glowing gases in glass tube. 4 When we draw the way light travels we always use straight lines. This is because normally light rays travel in a straight line. However, there are some instances that can change the path and even the nature of light. They are reflection, absorption, interference （干扰）, etc. 5 Physicists have attempted to measure the speed of light since the early times. In 1849, Hippolyte Fizeau conducted an experiment by directing a beam of light to a mirror located kilometers away and placed a rotating cogwheel（旋转齿轮）between the beam and the mirror. From the rate of rotation of the wheel, number of wheel’s teeth and distance of the mirror, he was able to calculate that the speed of light is 313 million meters per second. In a vacuum（真空）,however, the speed of light is 299,792,458 meters per second. This is about a million times faster than the speed of an airplane. 23. Paragraph 2 ______ 24. Paragraph 3 ______ 25. Paragraph 4 ______ 26. Paragraph 5 ______ A. How is the nature of light explained today? B. What are sources of light? C. How did physicists measure the speed of light? D. How does light travel? E. How did people think of light years ago? F. What causes a shadow? 27. Objects are visible to the human eye as light is ______ 28. Stars, flames, flashlights are some examples of ______ 29. Some instances such as reflection and absorption can change ______ 30. Hippolyte Fizeau conducted an experiment to measure ______ A. sources of light B. the speed of light C. the path of light D. a straight line E. a beam of light F. a form of energy

单选题These programmes are of immense importance to the young students. A. natural B. fatal C. slight D. enormous

单选题The suspect was arrested yesterday and released this morning. A. freed B. relieved C. kicked D. liberated

单选题He longed to be famous and respected.A. hopedB. wantedC. was eagerD. wished

单选题You startled me when you shouted.

单选题{{B}}第二篇{{/B}} {{B}}Mobile Phone and Diseases{{/B}} A study by scientists in Finland has found that mobile phone radiation can cause changes in human cells that might affect the brain, the leader of the research team said, But Darius Leszczynski, who headed the 2-year study and will present findings next week at a conference in Quebec(魁北克), said more research was needed to determine the seriousness of the changes and their impact on the brain or the body. The study at Finland’s Radiation and Nuclear Safety Authority found that exposure to radiation from mobile phones can cause increased activity in hundreds of proteins in human cells grown in a laboratory, he said. “We know that there is some biological response. We can detect it with our very sensitive approaches, but we do not know whether it can have any physiological effects on the human brain or human body,” Leszczynski said. Nonetheless the study, the initial findings of which were published last month in the scientific journal Differentiation, raises new questions about whether mobile phone radiation can weaken the brain’s protective shield against harmful substances. The study focused on changes in cells that line blood vessels and on whether such changes could weaken the functioning of the blood-brain barrier, which prevents potentially harmful substances from entering the brain from the bloodstream, Leszczynski said. The study found that a protein called hsp27 linked to the functioning of the blood-brain barrier showed increased activity due to irradiation and pointed to a possibility that such activity could make the shield more permeable(能透过的), he said. “Increased protein activity might cause cells to shrink—not the blood vessels but the cells themselves—and then tiny gaps could appear between those cells through which some molecules could pass.” he said. Leszczynski declined to speculate on what kind of health risks that could pose, but said a French study indicated that headache, fatigue and sleep disorders could result. “These are not life-threatening problems but can cause a lot of discomfort,” he said, adding that a Swedish group had also suggested a possible link with Alzheimer’s disease. “Where the truth is do not know,” he said. Leszczynski said that he, his wife and children use mobile phones, and he said that he did not think his study suggested any need for new restrictions on mobile phone use.

单选题This poem depicts the beautiful scenery of a small town in the South. A. describes B. draws C. writes D. introduces

单选题She has got a good job and earns {{U}}a lot of{{/U}} money.

单选题Trees 1. Trees are plants that survive year after year and have a single main stem composed entirely of wood. Some kinds grow to only ten feet, Others attain heights of more than 350 feet. These giants also have stems that are as much as 100 feet in circumference (圆周). 2. Over 25,000 different species of tree grow around the wood, except near the North and South Poles. They all belong to one of two possible groups. They are either coniferous (松类的) or deciduous (落叶的). Coniferous trees are evergreens (常绿的), such as pine or fir, which bear needlelike foliage (叶子) all year long. Many deciduous trees have broad leaves, which they usually shed each year at the beginning of the cold season. 3. Trees provide people with a host of oils, drugs glues, candy, cloths, fuels, and well over 10,000 wooden products. Some have unique qualities that make their wood valuable for special purposes. One particular type of tree, for example, is used to make fishing rods because it is not strong but unusually flexible. Queensland walnut is used by the electrical industry in Australia, because it is almost as good an electrical insulator as rubber. One of the world most unusual trees is the teak (柚木). It is one of the heaviest of all woods, and it has the largest leaves of any tree. These enormous leaves are two feet square and their surface is so tough and coarse that cabinetmakers in India use them as sandpaper. Teakwood itself is so heavy that when a teak tree is first cut down it will not float in water. It takes three years for the ten or fifteen-ton trunk to dry out enough so it will not sink. 4. Of all the world"s billions of living trees, the tallest is a giant redwood in California. It towers 368 feet. This redwood tree is anchored and nourished by a massive root system. It extends over three full acres.

单选题Everyone aboard the ship perished when it sank.A. disappearedB. survivedC. woundedD. died

单选题She all but fainted when she heard the news.

单选题Patricia stared at the other girls with resentment.A. loveB. surpriseC. angerD. doubt

单选题The loss of her cat was the greatest Ugrief/U the child had known.

单选题The house stands as steady as a rock in the wind.A. continuousB. quickC. firmD. exceptional

单选题It is obvious that he will win the game.

单选题High-tech Warfare Today, high-tech warfare (战争) is no longer an abstract concept, but a real issue. Technology 1 tactics, sociology, and the development of weaponry (武器). It also causes the changes in battles. Then what are the new characteristics of modern battles 2 by the application of high technologies? High-tech warfare naturally includes high technology. In modern battles, a single kind of weapon can hardly be 3 . Various weaponry, such as intelligence detection and information processing, should 4 well with each other. Aerial (航空的) weaponry becomes the main force in battles in the sky. Precision homing (精确自导) weaponry like cruise missiles and missiles 5 satellite homing systems becomes the main attack weapons. Battle control systems play a dominant role. Various weapons and logistics (后勤) systems are 6 into a comprehensive framework, centrally representing the modern high-tech weaponry. Depending on various 7 equipment and means in electronic warfare, our army will not be passively beaten. 8 the battlefield, high-tech warfare has created a type of non-linear (非线性的) chaos. Because of the use of long-range precision weaponry, the opposite parties in warfare can"t "touch" or "see" each other, and distance is no longer the decisive factor affecting the 9 of battles. It is hard to clearly define the lines between the frontier and the rear, as well as attack and defense. The traditional three-dimensional air-sea battlefield will be 10 by the multi-dimensional battlefield composed of air, sea, magnetic, electrical and information battlefields. No large-scale movements can be conducted 11 . Because modern weaponry systems are closely related to chains of demand and communication and electronic technology, the parties 12 have to pay attention to the usufruct (使用权) and control of electromagnetic frequency spectrum. So electronic warfare becomes 13 important and the necessary guarantee of victory. Whatever 14 warfare goes to and whatever Cloak (宽大外衣) it wears, it always violates peace and brings the world bloodshed (流血). Most people think of high technology as a 15 to enhance their lives, and they don"t wish it to be used to destroy lives.

单选题During his life he was able to accumulate quite a fortune.