For almost forty years the Empire State Building in New York City Was the world’

    For almost forty years theEmpire State Building in New York City Was the world’s tallest skyscraper (摩天大楼)．Thebuilding reaches a height of 1,250 feet．Ithas 102 floors．The use of steel frames made itsheight possible．Steel walls can rise high withoutneeding to be thick．Steel frame construction is strong．All plates are fixed firmly togetherby metal bolts (螺栓) called rivets (铆钉)．Whenset in place, rivets are usually red-hot．Oneend is already rounded．A riveter uses a special hammer toshape the other end．Then the rivet cools．It holds the plates firmly．

The word “plates” in this article might mean   

A.盘子

B.金属板

C.横木板

D.铜牌

试题答案

答案：B