问题详情

E
The Petronas Twin Towers in Kuala Lumpur in Malaysia were completed in 1998. Each tower is 452 meters high and has 88 floors. Designed to serve all floors， the four executive lifts(公务电梯) in each tower transport passengers from the underground car park to the top floor in 90 sec-onds. The towers are joined 170 meters up by a two-level bridge on the 4lst and 42nd floors.
The Sears Tower in Chicago in the United States was the tallest building in the world for more than 20 years. Completed in 1973， the tower is 442 meters high. It has 110 floors and 14,771 square meters of space. Its non-stop lift goes up to the top floor at a speed of 487 meters per mi-nute. At 421 meters high. Jin Mao Tower in Shanghai is the tallest building in China. Completed in1999， it has 88 floors and has the world" s highest hotel rooms. This building was made to be
strong-it can stand typhoon(台风) winds of up t0 200 kilometers per hour. Burj Dubai is a modern building presently under construction in Dubai in the United ArabEmirates. Because of the strong desire to build the world " s tallest building， much information about Burj Dubai is kept secret. However， experts expect the tower to have 162 floors and go up to808 meters high. Its lifts will be the fastest in the world， traveling at 18 meters per second. It is due to be completed in 2008 0r 2009.
72. What joins the Petronas Twin Towers 170 meters up？
(A) A flat floor.
(B) A non -stop lift.
(C) A long passage.
(D) A two -level bridge.请帮忙给出正确答案和分析，谢谢！