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 or comet towards Earth. The smallest miscalculation (误算) in orbit could fire it straight at Earth—with deadly consequences.

　　There is also the question of the Moon. As the current issue of　Scientific American　magazine points out, if Earth was pushed out of its current position, it is　“most likely the Moon would be stripped away from Earth”. This would greatly change our planet’s climate.

　　1. What makes the scientists plan to move 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.

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

　　A. 12 billion　B. 6 billion　C. 18 billion　D. 24 billion

　　3. What serious problems might the plan cause according to the passage?

　　A. The comet might hit Earth and man might lose the Moon.

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

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

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