Questions 22 to 25 are based on the passage you have just heard.-|||-22.A)Sharks are the first fish known to have networks of friends.-|||-B)Sharks are the first fish known as solitary animals.-|||-C)Sharks do not have any social networks.-|||-D)Sharks do not have interactions with each other.-|||-23.A)They used the acoustic tracking devices.-|||-B)They took photos of the sharks in the sea.-|||-C)They studied the sharks in the laboratory.-|||-D)They gathered the sharks into groups.-|||-24.A)17 friends. B)70friends.-|||-C)200friends. D)100friends.-|||-25.A)He hopes the research can know more about the sharks'gathering areas.-|||-B)He hopes the research will map the sharks'swimming routes.-|||-C)He hopes the research will help the study of the sharks in the laboratories.-|||-D)He hopes the research will provide conservation info to protect sharks.

14.(单选题)When the piston moves up with both intake and exhaust valves closed, we call it ___.A. intake strokeB. compression strokeC. power strokeD. exhaust stroke

Passage Two-|||-Questions 19 to 21 are based on the passage you have just heard.-|||-19.A)Nobel Prize for Peace. B)Nobel Prize for Economics.-|||-C)Nobel Prize for literature. D)Nobel Prize for Medicine.-|||-20.A)The Royal Swedish Academy of Sciences.-|||-B)The Karolinska Institute of Stockholm,Sweden.-|||-C)The Swedish Academy.-|||-D)The Nobel Foundation.-|||-21.A)On December 10,1910. B)OnDecember 10,1968.-|||-C)On December 10,1905. D)OnDecember 10,1940.

一、单选题。(共50题，总共100分) 49. Lack of confidence is a big___to investment in the region.(2分) squareA.gap squareB.block squareC.problem squareD.barrier

Read the passage and check your understanding by doing the multiple choice exercises.People's Love to Communicate Never ChangesIn the past, it was a small stamp that helped family members and friends to keep in touch with each other. With the coming of the telephone, people could not only read words, but also hear each other's voices. Later, the rise of the Internet joins people in different places with instant communication software which gives people even more ways to communicate.Most young people want to enjoy the warm love from their family and friends, but not too much control from them. They want to follow the time closely, but they also long for peace of mind. The new ways of communication make this possible. Often, they only need a simple "Hello" to change yesterday's strangers into today's friends. And they can also keep silent in WeChat Moments.There are pros and cons in this change. Some people may worry about their privacy. Some parents may worry about their children's WeChat Moments which are much larger and different from their own! However, the new ways of communication could give them freedom and chance to make smart choices. Parents can also have a try themselves!(1)单选题What helped people to keep in touch in the past?A. Telephone calls.B. The Internet.C. A small stamp.D. Instant messaging

我们需要一名卡车司机,你完全适合这项工作。A. We need a driver, and you are perfect for this job.B. We need a truck driver, and you are perfect.C. We need a driver, and you are perfect for this job.D. We need a truck driver, and you are perfect for this job.

Where could people see flying carpets and wind-fire wheels in the past?A. In science fiction movies.B. In modern inventions.C. In myths or people's dreams.D. In historical records.

失败是成功之母。(完成句子) Failure is the mother of .

The Development of Television Technology Radio and television were major agents of social change in the 20th century. Radio was once the center for family entertainment and news. Television enhanced this revolution by adding sight to sound. Both opened the windows to other lives, to remote areas of the world, and to history in the making. News coverage changed from early and late editions of newspapers to broadcast coverage from the scene. Play-by-play sports broadcasts and live concerts enhanced entertainment coverage. For many, the only cultural performances or sports events they would ever hear or see would emanate from the speakers or the screens in their living rooms. Each has engaged millions of people in the major historical events that have shaped the world. If people could look at the sky and see how it is organized into frequency bands used for different purposes, they would be amazed. Radio waves crisscross the atmosphere at the speed of light, relaying incredible amounts of information---navigational data, radio signals, television pictures--using devices for transmission and reception designed, built, and refined by a century of engineers. Key figures in the late 1800s included Nikola Tesla, who developed the Tesla coil, and James Clerk Maxwell and Heinrich Hertz, who proved mathematically the possibility of transmitting electromagnetic signals between widely separated points. It was Guglielmo Marconi who was most responsible for taking the theories of radio waves out of the laboratory and applying them to practical devices. His "wireless" telegraph demonstrated its great potential for worldwide communication in 1901 by sending a signal--the letter "s"--in Morse code a distance of 2,000 miles across the Atlantic Ocean. Radio technology was just around the comer. Immediate engineering challenges addressed the means of transmitting and receiving coded messages, and developing a device that could convert a high frequency oscillating signal into an electric current capable of registering as sound. The first significant development was "the Edison effect", the discovery that the carbon filament in the electric light bulb could radiate a stream of electrons to a nearby test electrode if it had a positive charge. In 1904, Sir John Ambrose Fleming of Britain took this one step further by developing the diode which allowed electric current to be detected by a telephone receiver. Two years later, American Lee De Forest developed the triode, introducing a third electrode (the grid) between the filament and the plate. It could amplify a signal to make live voice broadcasting possible, and was quickly added to Marconi’s wireless telegraph to produce the radio. Radio development was hampered by restrictions placed on airwaves during World War I. Technical limitations were also a problem. Few people had receivers, and those that did had to wear headsets. Radio was seen by many as a hobby for telegraphy buffs. It would take a great deal of engineering before the radio would become the unifying symbol of family entertainment and the medium for news that was its destiny. In the mid-1920s, technical developments expanded transmission distances, radio stations were built across the country, and the performance and appearance of the radio were improved. With tuning circuits, capacitors, microphones, oscillators, and loudspeakers, the industry blossomed in just a decade. By the mid-1930s almost every American household had a radio. The advent of the transistor in the 1950s completely transformed its size, style, and portability. Both television and radar were logical spin-offs of the radio. Almost 50 years before television became a reality, its fundamental principles had been independently developed in Europe, Russia, and the United States. John Baird in England and Charles Jenkins in the United States worked independently to combine modulated light and a scanning wheel to reconstruct a scene in line-by-line sweeps. In 1925, Baird succeeded in transmitting a recognizable image. Philo T. Farnsworth, a 21-year-old inventor from Utah, patented a scanning cathode ray tube, and Vladimir Zworykin of RCA devised a superior television camera in 1930. Regularly scheduled broadcasts started shortly thereafter, and by the early 1940s there were 23 television stations in operation throughout the United States. Shortly after World War Ⅱ, televisions began to appear on the market. The first pictures were faded and flickering, but more than a million sets were sold before the end of the decade. An average set cost 500 at a time when the average salary was less than 3,000 a year. In 1950 engineers perfected the rectangular cathode-ray tube and prices dropped to 200 per set. Within 10 years 45 million units were sold. A study of how human vision works enabled engineers to develop television technology. Images are retained on the retina of a viewer’s eye for a fraction of a second after they strike it. By displaying images piece by piece at sufficient speed, the illusion of a complete picture can be created. By changing the image on the screen 25 to 30 times per second, movement can be realistically represented. Early scanning wheels slowly built a picture line by line. In contrast, each image on a modem color television screen is comprised of more than 100,000 picture elements (pixels), arranged in several hundred lines. The image displayed changes every few hundredths of a second. For a 15-minute newscast, the television must accurately process more than 1 billion units of information. Technical innovations that made this possible included a screen coated with millions of tiny dots of fluorescent compounds that emit light when struck by high-speed electrons. Today this technology is in transition again, moving away from conventional television waves and on to discrete digital signals carried by fiber optics. This holds the potential for making television interactive--allowing a viewer to play a game or order action replays. Cathode ray tubes with power-hungry electron guns are giving way to liquid crystal display (LCD) panels. Movie-style wide screens and flat screens are readily available. Digital signals enable High Definition Television (HDTV) to have almost double the usual number of pixels, giving a much sharper picture. The advent of cable television and advances in fiber-optic technology will also help lift the present bandwidth restrictions and increase image quality.Guglielmo Marconi is the main person who applied ______ into practical devices. A．the theories of radio wavesB．electromagnetic signalsC．the Tesla coilD．wireless telegraph

( 填空题 20.0 分 ) Plant Trees Planting trees is fun and a great way to reduce 11 _ gases . Trees 12 _ carbon dioxide from the air . Recycle Recycle cans bottles plastic bags and newspapers . When you 13._ you send less trash to the 14 and you help save nature 15 ._ like trees oil and elements such as aluminum . When You Buy Buy Cool Stuff There are lots of ways we can improve the 16 . _One of the ways to 17 _the amount of greenhouse gases that we put into the air is to buy products that don t use as much 18 _ . Take Corporate Action Tell the companies you invest in that you care about 19._ warming . Don t like a company s attitude on global warming Go to 20. _ meetings and speak up ( shareholder , reduce , global , environment , absorb , energy , recycle , landfill , resources , greenhouse )