Question

3．Move Earth-It's Not Science FictionLONDON-Scientists have found an unusual way to prevent our planet from overheating：move it to a cooler spot．All you have to do is send a few comets（彗星）in the direction of Earth，and its orbit will be changed．Our world will then be sent spinning 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 his colleagues Don Kory can sky and Fred Adams，needs carefully directing a comet or asteroid （小行星）so that it passes close by our planet and sends some of its gravitational energy to Earth．
"Earth's orbital speed w ould increase as a result and we would move to a higher orbit away from the Sun，"Laughlin said．
Engineers would then direct their comet so that it passed close to Jupiter or Saturn．The comet would pick up energy from one of these giant planets．Later its orbit would bring it back to Earth，and the process would be repeated．
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 or comet towards Earth．The smallest miscalculation（误算）in orbit could fire it straight at Earth-with deadly results．
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．

67．What makes the scientists plan to move Earth？C
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．
68．If the plan is successful，Earth will have a working life ofAyears．
A.12 billion　B.6 billion　C.18 billion　D.24 billion
69．What serious problems might the plan cause according to the passage？A
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．
D．Earth's working life might be greatly shortened．
70．What does the underlined word"compromise"mean？D
A．Surround．B．Benefit．C．Share．D．Endanger．

Answer 1

分析 科学家们找到了一种非同寻常的阻止地球过热的方法--改变地球的轨道．

解答 小题67：选C．细节理解题．文章首句LONDON-Scientists have found an unusual way to prevent our planet from overheating：move it to a cooler spot说科学家们找到了一种非同寻常的办法防止地球过热，第六段The Sun is certain to heat up in about a billion years and so"seriously compromise"our biosphere（生物圈）-by cooking us，可知大约十亿年以后太阳肯定会更炙热，以至于将人类化为灰烬．故选C．
小题68：选A．细节理解题．根据文章第二段They say their plan could add another six billion years to the useful lifetime of our planet-effectively doubling its working life，可知他们把地球六十亿年的寿命加倍，是120亿，故选A．
小题69：选A．细节理解题．最后两段段意分别指出该计划可能带来的两大恶果：一是The smallest miscalculation（误算）in orbit could fire it straight at Earth-with deadly results，万一轨道计算出错会使被控星体撞向地球，二是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地球脱离原轨道后很可能会失去月球，从而导致气候巨变．故选A．
小题70：选D．词义猜测题．由前面The Sun is certain to heat up in about a billion years，可知大约十亿年以后太阳肯定会更加炙热，从而严重损害地球的生物圈，故选D．

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