TPO是我们常用的托福模考工具，对我们的备考很有价值，下面小编给大家带来托福阅读TPO7(试题+答案+译文)第1篇:The Geologic History of the Mediterranean。
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In 1970 geologists Kenneth J.Hsu and William B.F. Ryan were collecting research data while aboard the oceanographicresearch vessel Glomar Challenger.Anobjective of this particular cruise wasto investigate the floor of theMediterranean and to resolve questions aboutits geologic history. One questionwas related to evidence that theinvertebrate fauna (animals without spines) ofthe Mediterranean had changedabruptly about 6 million years ago. Most of theolder organisms were nearlywiped out, although a few hardy species survived. Afew managed to migrate into the Atlantic.Somewhat later, the migrants returned,bringing new species with them. Why didthe near extinction and migrationsoccur?
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