【托福阅读题型：The Pace of Evolutionary Change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 Pace of Evolutionary Change

　　【Paragraph 8】■Similar exhaustive studies are required for many different kinds of organisms from many different　periods. ■Most researchers expect to find that both modes of transition from one species to another are at work in　evolution. ■Slow, continuous change may be the norm during periods of environmental stability, while rapid evolution of　new species occurs during periods of environment stress. ■But a lot more studies like Sheldon' s are needed before we　can say for sure.(The Pace of Evolutionary Change)

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

　　They believe that environmental conditions may play a crucial role in determining which of the two modes will be in

　　operation over a given period.

　　Where could the sentence best fit?

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