Rock samples taken from the remains of an asteroid about twice the size of the 6-mile-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.
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Ahas been dated to be 3.47 billion years old and thus is
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Bhas been dated at 3.47 billion years old and thus
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Chave been dated to be 3.47 billion years old and thus are
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Dhave been dated as being 3.47 billion years old and thus
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Ehave been dated at 3.47 billion years old and thus are
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正确答案: E