短文填空。根据下列短文内容，根据首字母提示，在短文后的空格处填上一个恰当的词，使短文通顺，每空一词，含缩略词。
Do you know the differences between the new building and the old ones?
Old buildings h  1  brick(砖)and stone walls. The walls hold up the b  2  .
In cities, many modern building 1  3  as if they are made just of windows.Walls of dark glass reach
high into the air.  Many buildings are m  4  than 50  stories(层)tall.
Are walls of glass strong e  5  to hold up the new buildings? No, The new glass walls do not hold up
the buildings,b  6  they only cover up the frame(框架)made of steel.  Have you ever watched a new
building going up? The steel frame is built f  7  .  Then the glass walls are hung on the frame.  When the
building is f  8  , the frame does not show.  The outside looks like windows without walls. The glass walls
shine i  9  the sun with no decoration(装饰).Many people find t  10  beautiful just as they are.

查看答案