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Rock samples taken from the remains of an asteroid about twice the size of the 6-nuke-wide asteroid that eradicated the dinosaurs has been dated to be 3.47 billion years old and thus is evidence of the earliest known asteroid impact on Earth. A: has been dated to be 3.47 billion years old and thus is B: has been dated at 3.47 billion years old and thus C: have been dated to be 3.47billion years old and thus are D: have been dated as being 3.47 billion years old and thus E: have been dated at 3.47 billion years old and thus are C为何不对？请各位大虾指教！！！谢谢！！！  | 
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发表于 2009-7-21 10:43:00
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