Scientistshavefoundanunusualwaytopreventourplanetfrom...

問題詳情：

   Scientists have found an unusual way to prevent our planet from overheating: move it to a cooler spot. All you have to do is to send a few comets in the direction of Earth, and its orbit will be changed. Our world will then be sent into a safer, colder part of the solar system.

   This idea for improving our climate comes from a group of US National Aeronautics and Space Administration ( NASA) engineers and American astronomers. They say their plan could add another six billion years to the useful lifetime of our planet --- effectively doubling its working life.

   The plan put forward by Dr Laughlin, and Don Kory can sky and Fred Adams, needs carefully directing a comet of asteroid  so that it passes close by our planet and sends some of its gravitational energy to Earth.

   In the short term, the plan provides an ideal way to global warming, although the team was actually concerned with a much greater danger. The sun is certain to heat up in about a billion years and so “seriously compromise” our biosphere (生物圈) --- by cooking us.

   That's why the group decided to try to save Earth.

   The plan has one or two worrying aspects, however. For a start, space engineers would have to be very careful about how they directed their asteroid (小行星) or comet towards Earth. The smallest miscalculation (誤算) in orbit could fire it straight at Earth --- with deadly results.

   There is also the question of the Moon. As the scientific American magazine points out, if Earth was pushed out of its current (目前的) position it is “most likely that the Moon would betaken away from Earth,” it states. This would change our planet's climate.

32. If the plan is successful, Earth will have a working life of ____ years.

   A. 12 billion      B. 6 billion     C. 18 billion      D. 24 billion33. What makes the scientists plan to save Earth?

   A. A few comets are moving to the direction of Earth.

   B. Earth's working life is coming to an end soon.

   C. Earth will become too hot for mankind to keep alive.

   D. The moon is moving farther and farther away from Earth.

34. What does the underlined word “compromise” mean?

   A. provide             B. benefit     C. share          D. endanger35. What serious problems might the plan cause according to the passage ?

   A. Earth might be moved too far away and man might be frozen to death.

   B. The comet might hit Earth and man might lose the moon.

   C. The comet might hit Jupiter or Saturn and never return to Earth.

   D. Earth's working life might be greatly shortened.

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