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托福阅读句子插入题：Opportunists and Competitors

2015-08-14 12:22:18来源：网络

　　【托福阅读题型：Opportunists and Competitors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：Opportunists and Competitors

　　【Paragraph 5】Opportunists must constantly invade new areas to compensate for being displaced by more　competitive species. Human landscapes of lawns, fields, or flowerbeds provide settings with bare soil and a lack of　competitors that are perfect habitats for colonization by opportunists. ■Hence, many of the strongly opportunistic plants　are the common weeds of fields and gardens. ■

　　Paragraph 6: Because each individual is short-lived, the population of an opportunist species is likely to be adversely　　affected by drought, bad winters, or floods. ■If their population is tracked through time, it will be seen to be particularly　unstable—soaring and plummeting in irregular cycles. ■( Opportunists and Competitors)

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

　　Such episodic events will cause a population of dandelions, for example, to vary widely.

　　Where would the sentence best fit?

　　答案见下一页：

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