Why is the library the highest building?

Why is the library the highest building? Why is the library the highest building? why is the library the highest building?英语谜语 why is the library the highest builiding?急用! Why is the library the highest building（问个语法）Why is the library the highest building?请问,library后面为什么不加is? Why do people say the library is the highest building in the world? Where is the library? Where is the library? Why is the library the highest building?（为什么图书馆是最高的建筑物?） Why is the library the highest buiding这是一道脑筋急转弯. Why don't you go to the school library with me?_____ _____ go to the school library with me?_____ _____going to the school with me? The library is on the Don't talk____in the library Maria is the library,填空 -IS jack in the library? Is that the library是什么意思 Where is your brother,Bill.I t he is in the schoo library.填空 Why don't you go to the school library with me?保持原意要两句（ ）（ ）go to the school library with me?（ ） （ ）going to the school library with me?