根據(jù)以下內(nèi)容，回答下面試題。

　　Passage Three

　　Alaska, which was called Russian America before it was sold to U. S. A. ,joined the union as the forty-ninth state in 1959.

　　Alaska is now the largest of all the 50 states of the U. S..

　　It was in 1867 that President A. Johnson's Secretary of State(國務(wù)卿) ,Seward bought Alaska from the Russians at a cost of 7.2 million. The buying of the huge northern land mass seemed at first something foolishly done. Not only was Alaska difficult to reach, but it was also hard to bye in, and it appeared to have no importance in time of war. Besides, there are volcanoes there as Alaska hes on the Pacific" ring of fire". In Alaska large treeless areas are covered with snow all the year. For these reasons the buying of Alaska was called "Seward's Fooly" at that time.

　　However, in 1896 gold was found in Alaska, and people poured tin to the land quickly. Since then other important natural resources were discovered, including oil. Soon people changed their thinking about "Seward's Fooly". But most people visit Alaska in order to see the endless beauty of nature that the northern land discloses to them. For instance, there are a- bout 11,000 islands in Alaska. And in a certain area of Alaska the sun does not set for 82 days

　　every year.

　　第44題 Alaska belonged to__________before 1867.

　　A.Russia　B.America　C.Canada　D.Japan

　　答案：A

　　第45題 The buying of Alaska was first called__________.

　　A.a foolish thing　B.Seward's Fooly

　　C.Johnson's Fooly　D.President's Foolishness

　　答案：B

　　第46題 Volcanoes__________in Alaska as__________.

　　A.are not found ;large parts of the land is covered with snow

　　B.are not found ;it is at the northern top of America

　　C.are found; it is on the Pacific" ring of fire"

　　D.are found;there are so many islands

　　答案：C

　　第47題 Tourists came to Alaska to__________.

　　A.study its importance in war　B.study its volcanoes

　　C.enjoy its freezing weather　D.enjoy its beauty of nature

　　答案：C

　　根據(jù)以下內(nèi)容，回答下面試題。

　　Passage Four

　　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 Bool of World Records as the world's largest underground lake. The Lost Sea is part of an extensive and historic cave system called Craighead 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. Approximately one mile from the entrance, in room called "the Council Room", many Indian artifacts have been found. Some of the items discovered include pottery, arrowheads, weapons, and jewelry.

　　For many years there were persistent rumors of a large underground lake somewhere in a cave, but it was not discovered until 1905. In that year, a thirteen-year-old boy named Ben Sands crawled through 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 onto it in glass-bottomed boats powered by electric motors. More than thirteen acres of water have been mapped out so far and still no end to 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.

　　第48題 The Lost Sea is unique because it is__________.

　　A.part of a historical cave system

　　B.the biggest underground lake in, the world

　　C.listed in the Gninness Book of World Records

　　D.the largest body of water in Tennessee

　　答案：B

　　第49題 The Craighead Caverns have been known__________.

　　A.through history　B.since the time of the Indian Nations

　　C.since 1905　D.since divers explored them

　　答案：B

　　第50題 Who located the Lost Sea in recent times?

　　A.The Cherokee Indians.　B.Tourism.

　　C.Ben Sands.　D.Scientists.

　　答案：C

　　第51題 It can be inferred from the passage that the Craighead Caverns presendy serve as__________.

　　A.an underground testing site　B.an Indian meeting ground

　　C.a tourist attraction　D.a motor boat race course

　　答案：C