题目

It was ________ was a waste land ten years ago _______ a modern city has been set up on.       A. which; where    B. where; that    C. what; that               D. that; which 答案：C 解析: 略许多家庭的门上都装有防盗门镜（“猫眼”）。从室内透过防盗门镜向外看，可以看到来客的正立、缩小的像。由此可以断定，此时防盗门镜的作用相当于一个A．凸透镜 B．凹透镜 C．三棱镜 D．玻璃砖