题目

Look at Uncle Liang’s new car. I wonder            .A.  when he bought it           B. when did he buy it       C. when he buys it 答案：A物体通过凸透镜可在光屏上成倒立、放大的实像，下列光学仪器应用了这一成像原理的是（　　）A．照相机B．放大镜C．投影仪D．汽车后视镜