【托福阅读题型：The Geologic History句子插入题】托福阅读中句子插入题是重要题型之一。根据托福阅读题型不同来进行专项练习，是短期提高托福阅读能力的有效方法。同学们需要多加练习哦!

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　　托福阅读句子插入题：The Geologic History

　　【Paragraph 2】■Another task for the Glomar Challenger’s scientists was to try to determine the origin of the　　domelike masses buried deep beneath the Mediterranean seafloor. ■These structures had been detected years earlier　by echo-sounding instruments, but they had never been penetrated in the course of drilling. ■Were they salt domes such　as are common along the United States Gulf Coast, and if so, why should there have been so much solid crystalline salt　beneath the floor of the Mediterranean? ■(The Geologic History of the Mediterranean)

　　Look at the four squares [■] that indicate where the following sentence could be added to the passage.

　　Thus, scientists had information about the shape of the domes but not about their chemical composition and origin.

　　Where would the sentence best fit?

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