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托福阅读句子简化题：Symbiotic Relationships

2015-08-18 17:06:22来源：网络

　　【托福阅读题型：Symbiotic Relationships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：Symbiotic Relationships

　　【Paragraph 5】The third type of symbiosis, mutualism, benefits both partners in the relationship Legume plants　　and their nitrogen-fixing bacteria, and the interactions between flowering plants and their pollinators, are examples of　mutualistic association. In the first case, the plants provide the bacteria with carbohydrates and other organic　compounds, and the bacteria have enzymes that act as catalysts that eventually add nitrogen to the soil, enriching it. In　the second case, pollinators (insects, birds) obtain food from the flowering plant, and the plant has its pollen distributed　and seeds dispersed much more efficiently than they would be if they were carried by the wind only. Another example of　mutualism would be the bull's horn acacia tree, which grows in Central and South America. The tree provides a place to　live for ants of the genus Pseudomyrmex. The ants live in large, hollow thorns and eat sugar secreted by the tree. The　ants also eat yellow structures at the tip of leaflets: these are protein rich and seem to have no function for the tree　except to attract ants. The ants benefit the host tree by attacking virtually anything that touches it. They sting other　insects and large herbivores (animals that eat only plants) and even clip surrounding vegetation that grows near the tree.　When the ants are removed, the trees usually die, probably because herbivores damage them so much that they are　unable to compete with surrounding vegetation for light and growing space.(Symbiotic Relationships)

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

　　○The relationship between flowering plants and pollinators provides pollinators with food and flowers with efficient　reproduction.

　　○In some cases birds obtain food from the seeds that are dispersed in the wind.

　　○The wind not only helps the flowers distribute their seeds but enables birds to find more food.

　　○Animals and insects are more effective in distributing pollen and seeds than the wind



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