答案:A
解析:
Choice (A) is correct. It avoids the errors of the other options by using the phrase "Its fossil record" to describe what has remained "virtually unchanged over 100 million years."
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答案:A
解析:
Choice (A) is correct. It avoids the errors of the other options by using the phrase "Its fossil record" to describe what has remained "virtually unchanged over 100 million years."