Responding to the public's fascination with-and sometimes undue alarm over-possible threats from asteroids, a scale developed by astronomers rates the likelihood that a particular asteroid or comet may collide with Earth.
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Aa scale developed by astronomers rates the likelihood that a particular asteroid or comet may
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Ba scale that astronomers have developed rates how likely it is for a particular asteroid or comet to
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Castronomers have developed a scale to rate how likely a particular asteroid or comet will be to
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Dastronomers have developed a scale for rating the likelihood that a particular asteroid or comet will
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Eastronomers have developed a scale that rates the likelihood of a particular asteroid or comet that may.
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正确答案: D