题目

I moved from Chicago to Brooklyn in July of 2010，just in time to watch my mother die. Our parents were both gone now； I took with me as many things they had left behind as I could. I was out walking one Saturday later that summer when something caught my eye - a pale green dress. Laid out on the pavement was stuff like earrings, glass candle-holders, books. Hanging on the fence behind were a few pairs of jeans and a green cotton dress. The woman, the host o£ the stoop (门廊）sale, looked like she was getting rid of a past she didn’t need or want. A dress that was too big for 如图是一台光学投影仪的结构示意图．其中C是________镜，它的作用是________，如果同学们觉得投影幕布上的画面小，那么应将B向________移动（上/下），同时调节投影仪，使它________幕布（靠近/远离）．