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GRE阅读模拟练习题(92)

2017-05-31 16:09:00来源：网络

　　为了帮助大家练习GRE阅读题考点，新东方在线GRE频道为大家带来GRE阅读模拟练习题一文，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!

　　Geese can often be seen grazing in coastal salt marshes. Unfortunately, their intense grazing removes the grassy covering, exposing marsh sediment; this increases evaporation, which in turn increases salt concentration in marsh sediments. Because of this increased concentration, regrowth of plants is minimal, leading to increased erosion, which leads to a decrease in the fertile topsoil, leading to even less regrowth. In time, the salt marsh becomes a mudflat. This process challenges one of the most widely held beliefs about the dynamics of salt-marsh ecosystems: supposedly, consumers such as geese do not play a large role in controlling the productivity of marsh systems. Rather, the standard view claims, marshes are controlled by bottom-up factors, such as nutrients and physical factors.

　　1.The author discusses “the standard view”(line 8 )most likely in order to identify a view that

　　A：explains the occurrence of the chain of events described in the passage

　　B：provides a summary of the chain of events described in the passage

　　C：is called into question by the chain of events described in the passage

　　D：advocates reassessment of the widely held belief described in the passage

　　E： is undermined by the widely held belief described in the passage

　　答案：C

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