It is listed by the Guinness Book of World Records as the world's largest underground lake. The Lost Sea is part of an extensive and historic cave system called Graihead Caverns. The Caverns have been known and used since the days of the Cherokee Indian nation. The Cave expands into a series of huge rooms from a small opening on the side of the mountain. One mile from the entrance, in a room called “The Council Room”， many Indian artistic facts have been found. 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 13yearold boy named Ben Sands crawled into a small opening three hundred feet underground, and he found himself in a large cave half filled with water. Today tourists visit the Lost Sea and ride far out in glassbottomed 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 of it is still unknown. 25. Why is the Lost Sea completely different from any other one?

 

Deep inside a mountain near Sweetwater in East Tennessee is a body of water known as the Lost Sea. It is listed by the Guinness Book of World Records as the world's largest underground lake. The Lost Sea is part of an extensive and historic cave system called Graihead Caverns.

The Caverns have been known and used since the days of the Cherokee Indian nation. The Cave expands into a series of huge rooms from a small opening on the side of the mountain. One mile from the entrance, in a room called “The Council Room”， many Indian artistic facts have been found.

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 13yearold boy named Ben Sands crawled into a small opening three hundred feet underground, and he found himself in a large cave half filled with water.

Today tourists visit the Lost Sea and ride far out in glassbottomed 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 of it is still unknown.

25. 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 largest 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.

26．The Graihead Caverns have been known ________.

A. throughout history

B. since the year 1905

C. since the time of the Indian nation

D. since divers explored them

27．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.

28．Which of the following is TRUE according to the passage?

A. The Lost Sea came into being not long ago.

B. The Lost Sea was believed to be somewhere long long ago.

C. The cave which was found was full of water.

D. The depth of the water has been found out now.

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