单项选择题
John Hancock Center is an experiment in engineering in terms of using （） for the first.
A.exoskeleton B.tower crane C.structural steel D.glass wall
单项选择题 Which of the following building used tower crane for the first time?（）
多项选择题 What are the features of a Victorian Brownstone house in Boston?（）
单项选择题 If you husband something valuable, you use it （）。
