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

　　The plan has one or two worrying aspects, though. For a start，space engineers would have to be very careful about how they directed their asteroid or comet towards Earth. The smallest miscalculation 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 points out, if Earth was pushed out of its current position，it is most likely that the Moon would be stripped away from Earth. This would greatly change our planet's climate.

　　文章大意：本文是科普性文章，介绍了科学家们的一个关于移动地球的设想。

　　5．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.

　　答案：C　细节理解题。根据第一段的第一句可知C项正确。

　　6．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

　　答案：A　细节理解题。根据第二段中的“They say their plan could add another six billion years to the useful lifetime of our planet—effectively doubling its working life.”可知答案为A项。

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