题目

Dear Annie, I have never written a letter to a newspaper before, I have just never felt the need to do such a thing. I have always felt I was quite able to do everything by myself. But now I know I was wrong. Sometimes you really need help in life, I guess. And that’s why I’m writing this letter to you. I have a happy family. I love my children and they love me . I’m a mother of three children. I know well how to bring up （带大）children, and two of them are already over twenty, so it is nothing new for me. But now I have a serious problem: the Internet problem. My little son is j30、在做“探究凸透镜成像规律”的实验中（1）小明将凸透镜正对太阳光，在透镜的另一侧移动光屏，在距透镜10cm处，屏上呈现出最小最亮的光斑，则此凸透镜的焦距约是10cm．（2）若将烛焰移至距凸透镜15cm处，移动光屏，使烛焰在屏上得到清晰的实像，幻灯机（照相机/幻灯机/放大镜）就是应用这一原理制成的．（3）移动透镜和光屏，直到在光屏上得到了一个倒立缩小的清晰的像，接着小莉同学将自己的近视眼镜镜片放在了蜡烛与凸透镜（靠近凸透镜）之间，发现光屏上的像变模糊了．①为了使屏上的像重新变得清晰，在不移动蜡烛和凸透镜位置的前提下，应将光屏向右（左/右）移动．②下列四个选项中，能正确表示小莉同学近视眼成像和矫正情况的是BA．乙甲；B．丙甲；C．乙丁；D．丙丁