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(短吻鱷),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(沼澤) 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(床墊).
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 本文屬于地理現(xiàn)象類的短文閱讀,主要描述美國佛羅里達(dá)州因沙灘和搖曳地棕櫚樹而享有盛名.但州內(nèi)大部分地區(qū)卻是沼澤地.并就奧克弗諾基沼澤地的成因等因素進(jìn)行了分析.

解答 45-48BDCA
45.B.細(xì)節(jié)理解題.根據(jù)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;故選B.
46.D.詞意猜測題.根據(jù)when引導(dǎo)的時(shí)間狀語從句…a large sandbar blocked most of the water flow to the sea可知,由于古時(shí)候海洋退潮時(shí)大部分水流被巨大的沙洲阻截了,由此可知,receded的含義應(yīng)該等同于draw back后退,退潮;故選D.
47.C.寫作意圖題.根據(jù)第三段的內(nèi)容描述以及They all want to know about its unusual name.一句可知,這段主要介紹的是Okefenokee這一名字的由來;故選C.
48.A.推理判斷題.根據(jù)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,如果沒有每隔一段時(shí)間就來臨的局部火災(zāi)將腐爛的植被燒毀,這很有可能就會(huì)充滿植物,湖泊干涸,變成另一片柏樹和松樹林,由此可推斷A項(xiàng)的描述正確;故選A.

點(diǎn)評 考點(diǎn):考查風(fēng)土人情類閱讀,讓學(xué)生在閱讀中找到相關(guān)的信息解答問題,推斷答案和詞義猜測.

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