题目内容
Why did Biarni set sail?
A．To find Canada．
B．To find his father．
C．To find Leif．
D．To find the Newfoundland．
Young people and older people do not always agree with each other. They sometimes have different ideas about living, working and playing. But in one special program in New York State, adults and teenagers live together in a friendly way.
Each summer 200 teenagers and 50 adults live together for eight weeks as members of a special work group. Everyone works several hours each day. They do so not just to keep busy but to find meaning and enjoyment in work. Some teenagers work in the woods or on the farms near the village. Some learn to make things like tables and chairs and to build houses. The adults teach them these skills.
There are several free ho urs each day. Weekends are free, too. During the free hours some of the teenagers learn photo-taking or painting. Others sit around and talk or sing. Each teenager chooses his own way to spend his free time.
When people live together, rules are necessary. In this program, the teenagers and the adults make the rules together. If someone breaks a rule, the problem goes before the whole group. They talk about it and ask, “Why did it happen? What should we do about it?”
One of the teenagers has this to say about the experience, “You stop thinking only about yourself. You learn how to think about the group.”
【小题1】In one special program in New York, young and older people .
| A．are friendly to each other |
| B．teach each other new ways of building houses |
| C．live together but do not work together |
| D．spend eight weeks together, working as farmers |
| A．the teenagers have to obey the rules the adults make |
| B．the members don’t have to obey the rules |
| C．the members are not allowed to break the rules they make together |
| D．the members have no free time except on weekends |
| A．disappointing | B．helpful | C．tiring | D．unpleasant |
| A．Rules of Living Together | B．Different Ideas about Living |
| C．Teenagers and Adults Together | D．Life in New York State |
You never see them, but they're with you every time you fly. They record where you are going, how fast you're traveling and whether everything on your airplane is functioning normally. Their ability to withstand 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 Comoros Islands in the India 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 mode for a black box, which became a requirement on all U.S. commercial flights by 1960. Early models often failed to withstand crashes, however, so in 1965 the device was completely redesigned and moved to the rear of the plane – the area least subject to（易遭受）impact – from its original position in the landing wells (起落架舱). The 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' conversations, and a flight-data recorder, which monitors 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 a quarter-inch-thick panels of stainless steel, the boxes can withstand massive force and temperatures up to 2,000℉. When submerged, they're also able to emit signals from depths of 20,000 ft.
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 approximately 20 deep-sea crashes over the past 30 years, only one plane's black boxes were never recovered.
【小题1】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. |
| A．New materials became available by that time. |
| B．Too much space was needed for its installation. |
| C．The early models often got damaged in the crash. |
| D．The early models didn't provide the needed data. |
| A．To distinguish them from the colour of the plane. |
| B．To caution people to handle them with care. |
| C．To make them easily identifiable. |
| D．To obey international standards |
| A．There is still a good chance of their being recovered. |
| B．There is an urgent need for them to be reconstructed. |
| C．They have stopped sending homing signals. |
| D．They were destroyed somewhere near Brazil. |
Animals Can Sense Natural Disasters
Among the dead in South Asia’ s tsunami（海啸）were many tourists at Sri Lanka’ s national wildlife park at Yala. But very few of the park’s animals — elephants, buffaloes, monkeys and wild cats — appear to have died. There are theories that animals can sense natural disasters and run away to safety.
First, it’s possible that the animals may have heard the quake before the tsunami hit. The underwater burst produced sound waves known as infrasound（次声）. Humans can’t hear infrasound, but many animals including dogs, elephants, tigers and pigeons can.
A second early warning sign the animals might have sensed is ground vibration（震动）. The great quake would have produced vibrational waves known as Rayleigh waves. These vibrations move through the ground like waves moving on the surface of the ocean but faster. They travel at ten times the speed of sound. The Rayleigh waves would have reached Sri Lanka hours before the water hit. Mammals, birds, insects and spiders can sense Rayleigh waves. So the animals at Yala might have felt the Rayleigh waves and then run to higher ground.
But what about humans? While we can’t hear infrasound, we can feel it, although we don’t necessarily know we’re feeling it. We also experience Rayleigh waves by special sensors in our joints（关节）, which exist just for that purpose. Sadly, it seems we don’t pay attention to the information when we get it. Maybe we screen it out because there’s so much going on before our eyes and in our ears.
【小题1】Why did few animals at Yala die when the tsunamis that caused a huge number of human deaths hit?
| A．Because human beings cannot hear the infrasonic sound. |
| B．Because the animals were staying at a higher place in the park. |
| C．Because the animals were able to run much faster than human beings. |
| D．Because the animals might have picked up the danger signals and ran away. |
| A．Rayleigh waves can be felt both by animals and human beings. |
| B．Rayleigh waves, just like infrasonic sound, can only be felt by animals. |
| C．Rayleigh waves are vibrational waves that usually cause quakes or tsunamis. |
| D．Rayleigh waves move on the ocean surface at a speed ten times that of sound waves. |
| A．We can’t feel the infrasound so we can’t be informed of the danger. |
| B．We ignore the information of tsunami’s coming even though we can also get it. |
| C．We were so busy on our minds that we feel neither infrasound nor Rayleigh waves. |
| D．We can feel Rayleigh waves and infrasound so we can escape the danger like animals. |