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Fossils of the arm of a sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of the Greater Antilles islands.
- sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of
- sloth, that they found in Puerto Rico in 1991, has been dated at 34 million years old, thus making it the earliest mammal known on
- sloth that was found in Puerto Rico in 1991, was dated at 34 million years old, making this the earliest known mammal of
- sloth, found in Puerto Rico in 1991, have been dated at 34 million years old, making the sloth the earliest known mammal on
- sloth which, found in Puerto Rico in 1991, was dated at 34 million years old, made the sloth the earliest known mammal of
这道让我屡做屡错的题目，竟然在NewYork Times上有原文，一摸一样的。 http://www.nytimes.com/1996/04/16/science/mammal-bones-found-in-amber-for-first-time.html
Fossils of the arm of a sloth, found in Puerto Rico five years ago, have been dated at 34 million years old, making it the earliest known mammal on the islands and presumably an inhabitant at the time of the hypothesized separation, Dr. MacPhee said. The age of the amber-preserved mammal, though not precise, could be further evidence of when these migrations occurred, particularly of when they might have ended. 倒数第三段。
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发表于 2009-6-4 18:23:00
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