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托福阅读词汇题：dispersal

2015-08-14 12:31:33来源：网络

　　【托福阅读题型：dispersal词汇题】托福阅读中词汇题是重要题型之一。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词汇题

　　托福阅读词汇题：dispersal

　　Dandelions are good examples of opportunists. Their seed heads raised just high enough above the ground to catch　the wind, the plants are no bigger than they need be, their stems are hollow, and all the rigidity comes from their water　content. Thus, a minimum investment has been made in the body that becomes a platform for seed dispersal. These　very short-lived plants reproduce prolifically; that is to say they provide a constant rain of seed in the neighborhood of　parent plants. A new plant will spring up wherever a seed falls on a suitable soil surface, but because they do not build　big bodies, they cannot compete with other plants for space, water, or sunlight. These plants are termed opportunists　because they rely on their seeds’ falling into settings where competing plants have been removed by natural processes,　such as along an eroding riverbank, on landslips, or where a tree falls and creates a gap in the forest canopy.　(Opportunists and Competitors)

　　The word “dispersal” in the passage is closest in meaning to

　　○development

　　○growth

　　○distribution

　　○protection

　　答案见下一页：

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