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12.The state of Florida is best known for its beaches and plam trees.But a good mass of it is swampland.The famous Everglades,a slow-moving sheet of water full of plants and alligators(短吻鳄),cover much of the southern part of the state.To the north,the Okefenokee,which is partly in Florida and mostly in neighboring Georgia,is a true swamp(沼泽) with its own alligatoers and snakes and even beautiful orchids.
It was formed when waters from an ancient ocean  receded and a large sandbar blocked most of the water flow to the sea.Left behind was an 1,800-square-kilometer swamp.
There's no big city within 200km,but tourists from all over the world manage to find it.They all want to know about its unusual name.Okefenokee is a Miccosukee Indian word meaning land of trtembling earth.Way back in the swamp are small,floating islands,called hammocks,which one can walk across.But they tremble.Standing on them is like trying to balance on a floating mattress(床垫).
The Okefenokee,which is already nearly filled with plants,would probably dry and become just another forest,were it not for range fires that come along every once in a while and burn out rotton vegetation(植被).So the water in this protected National Wildlife Refuge keeps moving-slowly,very slowly.

45.According to the passage,Everglades liesB.
A.mainly in Georgia
B.south of Okefenokee
C.north of Florida
D.near National Wildlife Refuge
46.The underlined word"receded"in the second pargaraph probably meansD.
A.dried up       B.floated away
C.poutred down   D.drew back
47.The third paragraph mainly tells usC.
A.where Okefenokee is located
B.what the size of the Okefenokeeis
C.how Okefenokee gets its special name
D.how shaking islands come into being
48.What can be inferred according to the text?A
A.Range fires prevent Okefenokee from drying up.
B.Hammocks tremble constantly but do not move.
C.Okefenokee's alliagtors attract many tourists.
D.Florida and Georgia cover 1,800km2 in total.

分析 本文属于地理现象类的短文阅读,主要描述美国佛罗里达州因沙滩和摇曳地棕榈树而享有盛名.但州内大部分地区却是沼泽地.并就奥克弗诺基沼泽地的成因等因素进行了分析.

解答 45-48BDCA
45.B.细节理解题.根据第一段…cover much of the southern part of the state.To the north,the Okefenokee,which is partly in Florida,可知,Everglades位于Okefenokee的南部;故选B.
46.D.词意猜测题.根据when引导的时间状语从句…a large sandbar blocked most of the water flow to the sea可知,由于古时候海洋退潮时大部分水流被巨大的沙洲阻截了,由此可知,receded的含义应该等同于draw back后退,退潮;故选D.
47.C.写作意图题.根据第三段的内容描述以及They all want to know about its unusual name.一句可知,这段主要介绍的是Okefenokee这一名字的由来;故选C.
48.A.推理判断题.根据最后一段中The Okefenokee,which is already nearly filled with plants,would probably dry and become just another forest,were it not for range fires that come along every once in a while and burn out rotton vegetation.可知,如果没有每隔一段时间就来临的局部火灾将腐烂的植被烧毁,这很有可能就会充满植物,湖泊干涸,变成另一片柏树和松树林,由此可推断A项的描述正确;故选A.

点评 考点:考查风土人情类阅读,让学生在阅读中找到相关的信息解答问题,推断答案和词义猜测.

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