【托福阅读题型：Plant Life in　Hawaii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：Plant Life in　Hawaii

　　【Paragraph 3】Lichens helped to speed the decomposition of the hard rock surfaces, preparing a soft bed of soil　that was abundantly supplied with minerals that had been carried in the molten rock from the bowels of Earth. Now, other forms of life could take hold: ferns and mosses (two of the most ancient types of land plants) that flourish even in rock　　crevices. ■These plants propagate by producing spores–tiny fertilized cells that contain all the instructions for making a　new plant–but the spore are unprotected by any outer coating and carry no supply of nutrient. ■Vast numbers of them fall　on the ground beneath the mother plants. ■Sometimes they are carried farther afield by water or by wind. ■But only

　　those few spores that settle down in very favorable locations can start new life; the vast majority fall on barren ground. By　force of sheer numbers, however, the mosses and ferns reached Hawaii, survived, and multiplied. Some species

　　developed great size, becoming tree ferns that even now grow in the Hawaiian forests. (The Arrival of Plant Life in　Hawaii)

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

　　So since the chances of survival for any individual spore are small, the plants have to produce many spores in order　to propagate.

　　Where could the sentence best fit?

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