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 lies__________.

  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 means__________.

A. dried up    B.floated away    C.poutred down    D.drew back

47.The third paragraph mainly tells us__________.

    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.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 1,800 km in total.

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