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GRE阅读基础24套练习题

2019-01-30 16:26:24来源：网络

　　为了帮助大家高效备考GRE，新东方在线GRE频道为大家带来“GRE阅读基础24套练习题”，希望对大家GRE备考有所帮助。更多精彩尽请关注新东方在线GRE频道!

GRE阅读基础24套练习题下载

　　GRE阅读基础24套练习题内容节选：

　　Exercise 1. 20min

　　Since the Hawaiian Islands have never been connected to other land masses, the great variety of plants in Hawaii must be a result of the long-distance dispersal of seeds, a process that requires both a method of transport and an equivalence between the ecology of the source area and that of the recipient area.

　　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.

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