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托福阅读句子插入题:The Origins of Cetaceans

2015-08-14 12:07:13来源:网络

  【托福阅读题型:The Origins of Cetaceans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!

  查看全部:托福阅读题型分类练习之句子插入题

  托福阅读句子插入题:The Origins of Cetaceans

  Extinct but already fully marine cetaceans are known from the fossil record. ■How was the gap between a walking mammal and a swimming whale bridged? ■Missing until recently were fossils clearly intermediate, or transitional, between land mammals and cetaceans.

  ■Very exciting discoveries have finally allowed scientists to reconstruct the most likely origins of cetaceans. ■In 1979, a team looking for fossils in northern Pakistan found what proved to be the oldest fossil whale. The fossil was officially named Pakicetus in honor of the country where the discovery was made. Pakicetus was found embedded in rocks formed from river deposits that were 52 million years old. The river that formed these deposits was actually not far from an ancient ocean known as the Tethys Sea.( The Origins of Cetaceans)

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

  This is a question that has puzzled scientists for ages.

  Where would the sentence best fit?

  答案见下一页:

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