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托福阅读词汇题：at random

2015-08-20 17:58:29来源：网络

　　【托福阅读题型：at random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：at random

　　【Paragraph 2】Spores light enough to float on the breezes were carried thousands of miles from more ancient　lands and deposited at random across the bare mountain flanks. A few of these spores found a toehold on the dark,　forbidding rocks and grew and began to work their transformation upon the land. Lichens were probably the first　successful flora. These are not single individual plants; each one is a symbiotic combination of an alga and a fungus. The　algae capture the sun's energy by photosynthesis and store it in organic molecules. The fungi absorb moisture and　mineral salts from the rocks, passing these on in waste products that nourish algae. It is significant that the earliest living　thing that built communities on these islands are examples of symbiosis, a phenomenon that depends upon the close　cooperation of two or more forms of life and a principle that is very important in island communities. (The Arrival of　Plant Life in Hawaii)

　　The phrase “at random” in the passage is closest in meaning to

　　○finally

　　○over a long period of time

　　○successfully

　　○without a definite pattern

　　答案见下一页：

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