题目内容
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When did the scientists start working on a successor to the shuttle？
A．Immediately after the Columbia disaster.
B．One year after the Columbia disaster.
C．Years before the explosion of Columbia.
D．Not mentioned in the passage.
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听力原文： Why don't birds get lost on their long flights from one place to another？ Scientists have puzzled over this question for many years. Now they are beginning to fill in the blanks.
Not long ago, experiments showed that birds rely on the sun to guide them during daylight hours. But what about birds that fly by night？ Tests with artificial stars have proved that certain night-flying birds are able to follow the stars in their long-distance flights.
A dove had spent his lifetime in a cage and had never flown under a natural sky. Yet it showed an inborn ability to use the stars for guidance. The bird's cage was placed under an artificial star-filled sky. The bird tried to fly in the same direction as that taken by his outdoor cousins. Any change in the position of the artificial stars caused a change in the direction of his flight.
But the stars are apparently their principal means of navigation. When the stars are hidden by clouds, they apparently find their way by such landmarks as mountain ranges, coast lines, and river courses. But when it's too dark to see these, the doves circle helplessly, unable to find their way.
The reason why birds don't get lost on long flights ______.
A．has been known to scientists for years
B．has only recently been discovered
C．is known by everyone
D．will probably remain a mystery
听力原文： Voice One: A bottlenose dolphin named Maui plays a computer game, helping scientists create a unique language [that] they hope humans and dolphins will understand.
It's not based on human words, but on a specific dolphin sound. Guess which one. Not its bark, or its clicks, made famous by Flipper. Words in this new language are whistled.
Dolphins typically whistle to each other under water, through a special structure just beneath their blowhole. Researchers say their whistles have meaning. For example, each dolphin learns from its mom its own signature whistle. So in human terms when they greet each other, it's not just, "Hi" It's, "Hi, my name is ..."--in this case, Maui.
Ken Marten and his team at Earthtrust in Sea Life Park Research Lab in Hawaii want to better understand how dolphins communicate. So for the next ten years, they will literally whistle while they work, creating this special language.
Voice Two: The rest of my career is dedicated to talking to these guys, so I guess you could call me Doctor Dolittle now.
Voice One: After studying dolphin whistles, Marten invented distinct whistles for various objects with which dolphins are familiar.
Which sound can be thought as dolphin's words？
A．Its bark.
B．Its clicks.
C．Its whistle.
D．Its crying.
As to the greenhouse effect, the author
A．shares the same view with the scientists
B．is uncertain of its occurrence
C．rejects it as being ungrounded
D．thinks that it will destroy the word soon
What would be detrimental to big scientific journals according to the author？
A．Big scientific scandals once in a while.
B．Small infractions all the time.
C．Unreliable research data in papers.
D．Lack of originality in research papers.
A.The Economist
B.New Scientist
C.Newsweek
D.The Spectator
A、where
B、where to
C、when did we
D、when we did
When did this conversation take place？
A．Morning.
B．Afternoon.
C．Evening.
D．Lunch time.
It can be inferred from the third paragraph that______.
A．the public's ignorance of scientific research results in attacks on science
B．a measure of mankind's humanity is taken into account
C．confusion and contradiction result from vulnerable campaigns
D．the debate is bound to aggravate in the next decade
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