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托福阅读句子简化题：Savanna Formation

2015-08-24 16:08:02来源：网络

　　【托福阅读题型：Savanna Formation句子简化题】托福阅读中句子简化题是重要题型之一。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简化题

　　托福阅读句子简化题：Savanna Formation

　　【Paragraph 5】Most savannas probably experience mild fires frequently and major burns every two years　or so. Many savanna and dry-forest plant species are called pyrophytes, meaning they are adapted in various ways to withstand occasional burning. Frequent fire is a factor to which rain forest species seem unable to adapt, although　ancient charcoal remains from Amazon forest soils dating prior to the arrival of humans suggest that moist forests also　occasionally burn. Experiments suggest that if fire did not occur in savannas in the Americas, species compositionwould change significantly. When burning occurs, it prevents competition among plant species from progressing　to the point where some species exclude others, reducing the overall diversity of the ecosystem. But in　experimental areas protected from fire, a few perennial grass species eventually come to dominate, outcompeting　all others. Evidence from other studies suggests that exclusion of fire results in markedly decreased plant-species　richness, often with an increase in tree density. There is generally little doubt that fire is a significant factor in　maintaining savanna, certainly in most regions.(Savanna Formation)

　　Which of the sentences below best expresses the essential information in the highlighted sentence in thepassage? Incorrect choices change the meaning in important ways or leave out essential information.

　　○ Rain forest species seem unable to adapt to fires created by humans.

　　○ Ancient charcoal remains suggest that, prior to the arrival of humans, fires occurred frequently in rain　forests.

　　○ Ancient charcoal remains in Amazon forests suggest that rain forest species adapted to the area long before　the arrival of humans.

　　○ Rain forest species appear unable to adapt to frequent fires, but evidence from the past suggests that rain　forests sometimes do burn.

　　答案见下一页：

本文关键字: 托福阅读题型 托福阅读训练 句子简化题

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