For many years it had been considered that there was a large underground lake somewhere in a cave, but it was not discovered until 1905. In that year, a 13-year-old boy named Ben Sands crawled（爬入）into a small opening three hundred feet underground, he found himself in a large cave half filled with water.

　　Today tourists visit the Lost Sea and ride far out into glass-bottomed boats. More than thirteen acres of water have been mapped out so far and still no end of the lake has been found. Even though teams of divers have tried to explore the Lost Sea, the full extent（长度）of it is still unknown.

　　66．Why is the Lost Sea completely different from any other one?

　　A．Because it is part of a historic cave system

　　B．Because it is the biggest underground lake in the world

　　C．Because it is listed in the Guinness Book of World Records

　　D．Because it is the largest body of water in Tennessee

　　67．The Craihead Caverns have been known

　　.

　　A．throughout history B．since the year 1905

　　C．since the time of the Indian nations D．since divers explored them

　　68．What was found in “The Council Room”?

　　A．A small natural opening. B．A large cave.

　　C．Another series of rooms. D．many things used by the Indians.

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