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托福阅读句子插入题(6)

2017-04-10编辑: 环球教育整理来自: 互联网

  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!

  托福阅读句子插入题:Colonizing the Americas

  【Paragraph 1】It has long been accepted that the Americas were colonized by a migration of peoples from Asia, slowly traveling across a land bridge called Beringia (now the Bering Strait between northeastern Asia and Alask○ during the last Ice Age. ■The first water craft theory about the migration was that around 11,000-12,000 years ago there was an ice-free corridor stretching from eastern Beringia to the areas of North America south of the great northern glaciers. It was the midcontinental corridor between two massive ice sheets-the Laurentide to the west-that enabled the southward migration. ■But belief in this ice-free corridor began to crumble when paleoecologist Glen MacDonald demonstrated that some of the most important radiocarbon dates used to support the existence of an ice-free corridor were incorrect. ■He  persuasively argued that such an ice-free corridor did not exist until much later, when the continental ice began its final retreat. ■(Colonizing the Americas via the Northwest Coast)

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

  Moreover, other evidence suggests that even if an ice-free corridor did exist, it would have lacked the resources

  needed for human colonization.

  Where could the sentence best fit?

  托福阅读句子插入题答案:3

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