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GRE阅读题目解析:夏威夷植物种类

2017-05-10 09:10:00来源：新东方在线整理

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　　查看全部：GRE阅读答案解析(汇总)

　　GRE阅读题目解析:夏威夷植物种类

　　P3

　　The great variety of plants in Hawaii is a result of the long-distance dispersal of seeds. There is some dispute about the method of transport involved. Some biologists argue that ocean and air currents are responsible for the transport of plant seeds to Hawaii. Yet the results of flotation experiments and the low temperatures of air currents cast doubt on these hypotheses. More probable is bird transport, either externally, by accidental attachment of the seeds to feathers, or internally, by the swallowing of fruit and subsequent excretion of the seeds. While it is likely that fewer varieties of plant seeds have reached Hawaii externally than internally, more varieties are known to be adapted to external than to internal transport. (119 words)

　　6. The author of the passage is primarily concerned with

　　(A) discussing different approaches biologists have taken to testing theories about the distribution of plants in Hawaii

　　(B) discussing different theories about the transport of plant seeds to Hawaii

　　(C) discussing the extent to which air currents are responsible for the dispersal of plant seeds to Hawaii

　　(D) resolving a dispute about the adaptability of plant seeds to bird transport

　　(E) resolving a dispute about the ability of birds to carry plant seeds long distances

　　7. The author mentions the results of flotation experiments on plant seeds most probably in order to

　　(A) support the claim that the distribution of plants in Hawaii is the result of the long-distance dispersal of seeds

　　(B) lend credibility to the thesis that air currents provide a method of transport for plant seeds to Hawaii

　　(C) suggest that the long-distance dispersal of seeds is a process that requires long periods of time

　　(D) challenge the claim that ocean currents are responsible for the transport of plant seeds to Hawaii

　　(E) refute the claim that Hawaiian flora evolved independently from flora in other parts of the world

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