玻璃幕墙的主要缺点有（）。
A.造价高
B.不安全
C.封闭性差
D.产生光污染
E.安装难度大
参考答案：A, D, E
Many towns and villages had their water supply ________ because there was no electricity.
A．cut through
B．cut off
C．cut up
D．cut down
脱丙烷塔顶温高，对各产品质量的影响？
