e A. a scale developed by astronomers rates the likelihood that a particular asteroid or comet may B. a scale that astronomers have developed rates how likely it is for a particular asteroid or comet to C. astronomers have developed a scale to rate how likely a particular asteroid or comet will be to (重复) D. astronomers have developed a scale for rating the likelihood that a particular asteroid or comet will E. astronomers have developed a scale that rates the likelihood of a particular asteroid or comet that may.
[此贴子已经被作者于2006-12-11 22:12:36编辑过] |