For almost forty years the Empire State Building in New York City was the world's tallest skyscraper． The building reaches a height of 1250 feet． It has 102 floors．

　　The use of steel frames made its height possible． Steel walls can rise high without needing to be thick． Steel-frame construction is strong． All plates are fastened together by metal bolts called rivets． When set in place, rivets are usually red-hot． One end is already rounded． A riveter uses a special hammer to shape the other end． Then the rivet cools． It holds the plates firmly．

　　High winds can move this strong building． A wind at a hundred miles an hour has swayed it almost one and a half inches．

1．The author says that the Empire State Building_____．

A．was finished in 1931　　 B．is in New York City

C．has fewer floors than the new World Trade Center D．None of the above

2．The account states that the building______．

A．was for many years the highest skyscraper B． reaches a height of 1250 feet

C．has 102 floors D．All of the above

3．In steel-frame building, the bottom walls______．

A．do not need to be thick　　B．must be very thick

C．must be two feet wide　　 D．need to be propped by wood

4．Rivets are described as being______．

A．picked up by tongs when red-hot B．usually caught in a scoop

C．usually put in place when red-hot D．held by an anvil during hammering

5．The riveter's task is to______．

A．drill holes for the rivet　　B．flatten the rounded end

C．shape the flat end　　　　D．cool the rivet

6．The amount of sway from the building's center in a high wind is given as______．

A．1．45 inches B．almost 1 ½ inches C． 2 ½ inches D． 1 ½ feet

  For almost forty years the Empire State Building in New York City was the world's tallest skyscraper（摩天大楼）. The building reaches a height of 1, 250 feet. It has 102 floors. The use of steel frames made its height possible. Steel walls can rise height without needing to be thick. Steel frame construction is strong. All plates are fixed firmly together by metal bolts（螺栓）called rivets （铆钉）. When set in place, rivets are usuall red- hot. One end is already rounded. A riveter uses a special hammer to shape the other end. Then the rivet cools. It holds the plates firmly. High winds can move this strong building. A wind of a hundred miles an hour has caused it to move almost one and a half inches.

  56．The writer says that the Empire State Building ________.
  A. hasn’t been finished
  B. is in New York City
  C. is the tallest skyscraper in the world now
  D. had fewer floors than the New World Trade Center
  57．In steel -frame building, the bottom walls________ .
  A. must be very thick
  B. must be rounded
  C. are usually red - hot
  D. do not need to be thick
  58．Rivets are described as being ________.
  A. picked up by tools when red -hot
  B. hit by tools when red - hot
  C. usually caught in a hole
  D. usually put in place when red - hot
  59．The word“ plates” in this article might mean ________ in Chinese.
A. 盘子    B. 钢板     C. 横木板    D. 铜牌

　For almost forty years the Empire State Building in New York City was the world's tallest skyscraper（摩天大楼）. The building reaches a height of 1, 250 feet. It has 102 floors. The use of steel frames made its height possible. Steel walls can rise height without needing to be thick. Steel frame construction is strong. All plates are fixed firmly together by metal bolts（螺栓）called rivets （铆钉）. When set in place, rivets are usuall red- hot. One end is already rounded. A riveter uses a special hammer to shape the other end. Then the rivet cools. It holds the plates firmly. High winds can move this strong building. A wind of a hundred miles an hour has caused it to move almost one and a half inches.

　The writer says that the Empire State Building ________.

　　A. hasn’t been finished

　　B. is in New York City

　　C. is the tallest skyscraper in the world now

　　D. had fewer floors than the New World Trade Center

　　　In steel -frame building, the bottom walls________ .

　　A. must be very thick

　　B. must be rounded

　　C. are usually red - hot

　　D. do not need to be thick

　　　Rivets are described as being ________.

　　A. picked up by tools when red -hot

　　B. hit by tools when red - hot

　　C. usually caught in a hole

　　D. usually put in place when red - hot