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C
Americans get some of their news and entertainment from public television and radio. These public media receive money to operate from private citizens, organizations and government. Many of their programs are educational. But most of the American media are run by businesses for profit. These privately owned media have changed greatly in recent years. Newspapers, magazines and traditional broadcast television organizations have lost some of their popularity. At the same time, online, cable and satellite media have increased in numbers and strength. So have media that serve racial groups and those communicating in foreign languages.
In general, more media than ever now provide Americans with news and entertainment. At the same time, fewer owners control them. Huge companies have many holdings(股份). In some areas, one company controls much of the media. One dramatic change in American media is the increased success of cable television. It comes into most homes over wires. It does not use the public airwaves to present programs, as broadcast television does. Like broadcast television, most cable television programs perform advertisements. This is true although people must pay to see cable television in their homes. Thirty years ago, few people had cable. Today, about sixty-eight percent of American homes have cable television. Television by satellite also is gaining popularity.
Over the years, traditional broadcast organizations have tried to appeal to as many watchers as possible. Many cable companies, however, present programs for one special group of viewers. For example, there are cable stations for people who like books, cooking, travel, golf or comedy.
28.Which of the following is true about American public media?
A. They depend on the government. B. They are controlled by the government
C. They are free        D. They can earn money.
29.Which of the following properly shows the change in these privately owned media?
A. Newspapers are getting more popular.
B. Satellite media is getting more popular.
C. Traditional media also serve racial groups.
D. Some media make their programs in foreign languages
30.From the second paragraph, we learn that           .
A. cable TV is free
B. more media are out of control
C. American media is dramatic
D. broadcast TV and cable TV programs include sales messages
31.What would be the best title for the text?
A. American news and entertainment      B. media in the United States
C. Public television and radio media     D. Cable programs in the United States
 
 
D
You never see them, but they are with you every time you fly. They record where you’re going, how fast you’re traveling and whether everything on your airplane is functioning normally. Their ability to stand almost any disaster makes them seem like something out of a comic book. They’re known as the black box
When planes fall from the sky, as a Yemeni airliner did on its way to the Comoros Islands in the Indian Ocean June 30, 2009, the black box is the best bet for identifying what went wrong. So when a French submarine(潜水艇) detected the device’s homing signal five days later, the discovery marked a huge step toward determining the cause of a tragedy in which 152 passengers were killed.
In 1958, Australian scientist David Warren developed a flight-memory recorder that would track basic information like altitude and direction. That was the first model for a black box, which became a requirement on all U.S commercial flights by 1960. Early models often failed to stand crashes, however, so in 1965 the device was completely redesigned and moved to the rear(尾部)of the plane--- the area least subject to impact--- from its original position in the landing wells (起落架舱). That same year, the Federal Aviation Authority required that the boxes, which were never actually black, be painted orange or yellow to aid visibility.
Modern airplanes have two black boxes: a voice recorder, which tracks pilots’ conversation, and a flight-data recorder, which monitor fuel levels, engine noises and other operating functions that help investigators reconstruct the aircraft’s final moments. Placed in an insulated(隔绝的) case and surrounded by quarter-inch-thick panels of stainless steel, the boxes can stand massive force and temperatures up to 2,000℉. When they went under the water, they’re also able to emit signals from depths of 20,000 feet. Experts believe the boxes from Air France Flight 447, which crashed near Brazil on June 1,2009, are in water nearly that deep, but statistics say they’re still likely to  turn up. In the about 20 deep-sea crashes over the past 30 years, only one plane’s black boxes were never found.
32. What does the author say about the black box?
A. It ensures the normal functioning of an airplane
B. The idea for it’s design comes from a comic book
C. Its ability to avoid disasters is incredible
D. It is an necessary device on an airplane
33 What information could be found from the black box on the Yemeni airliner?
A. Data for analyzing the cause of the crash
B. The total number of passengers on board
C. The scene of the crash and extent of the damage
D. Homing signals sent by the pilot before the crash
34. Why did the Federal  Aviation Authority require the black boxes be painted orange or yellow?
A. To tell them from the color of the plane B. To caution people to handle them with care
C. To make them easily identified D. To meet international standards
35. What do we know about the black boxes from Air France Flight 447?
A. There is still a good chance of their being found
B. There is an urgent need for them to be restructured
C. They have stopped sending homing signals
D. They were destroyed somewhere near Brazil
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