题目内容
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When does the flight arrive in London？
A.The departure time is 10:10
B.The arrival time is 10:10
C.It leaves at 10:10
D.It stops in Beijing at 10:10.
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A sound is a pressure disturbance: a sonic boom, like other explosive sounds, is the result of an abrupt change in pressure. An airplane in subsonic flight produces weak changed in pressure, but because these disturbances travel at the speed of sound, they move faster than the airplane and stay in front of it. In effect, these disturbances warn the air to get out of the way, and the an does just jet, however, gets ahead of its own pressure disturbances. Consequently a wave of suddenly com pressed air--a shock wave--builds up and is thrown off like the wave ;hat spreads from the bow of a speedboat.
Can sonic booms be eliminated？ The answer is a categorical negative--they are an innerent(内在的) part of supersonic flight--but the sonic boom probably can be reduced; government and private research is now under way to improve understanding of the sonic boom. If and when the booms can be reduced to tolerable levels, commercial supersonic transports can come rata service.
Before commercial airliners travel faster than sound, problems must 0e solved regarding ______.
A．design
B．Construction
C．operation
D．all of the above
【B5】, this spurt of suburban expansion does not alter the basic fact that the United States【B6】one of the most urban nations on the face of the earth. Census Bureau【B7】show that the【B8】population has been shrinking steadily since 1880. When the United States became a nation it had no large cities at all; today【B9】fifty cities have populations of more than 258,000. Mammoth complexes of cities are developing in the area of the East Coast and the east north central states, on the pacific and Gulf coasts, and near the shores of the Great Lakes. Some sociologists now regard the entire 600-mile stretch between Boston and Washington, D.C.—an area holding a fifth of the country's population—【B10】one vast city or, as they call it, megalopolis.
【B1】
A．past
B．recent
C．future
D．nowadays
A.Tornado
B.Thunderstorm
C.Storm
D.Turbulence
When does a baby take an interest in books？
A．After nine months.
B．At two months.
C．After five months.
D．In middle infancy.
When does a baby became frightened of unfamiliar people？
A．In early infancy.
B．In middle infancy.
C．In late infancy.
D．In the toddler stage.
A.When you have time， what does you do
B.What do you do when you has time
C.When do you do what you have time
D.What do you do when you have time
What does Cindy mean by "cheating at both ends"？
A．Do things for family when she is supposed to be at work.
B．Work for the company while she is supposed to stay at home.
C．Meet the demands of both family and work with a flexible schedule.
D．Balance the needs of her family against the demands of her work.
What does a man do when he cannot get exactly what he wants？
A．He buys a similar thing of the color he wants.
B．He usually does not buy anything.
C．At least two of his requirements must be met before he buys.
D．So long as the style. is right, he buys the thing.
