如图所示，一束光在平面镜上发生反射，反射光恰好照在光屏的A处。若要让反射光照在光屏的B处，下列方法中可行的是
A．只将光屏竖直向下移动一段距离
B．只将平面镜水平向右移动一段距离
C．只将平面镜绕入射点O顺时针转过一定角度（＜90°）
D．只将平面镜绕入射点O逆时针转过一定角度（＜90°）
答案：C
题目分析：A选项，将光屏竖直向下移动一段距离，反射光将落在A点的左侧。B选项，将平面镜水平向右移动一段距离，反射光线落在光屏上的位置不变。C选项，平面镜绕入射点O顺时针转动，反射光线也绕O点顺时针转动，会落到B点。D 选项，如果平面镜绕O点逆时针转动，反射光线将落在A点的左侧。
| 先阅读（一）（二）两篇短文。然后根据题目要求及所给语境完成下列四项任务。 （一）
Are you the only child in your family? If so, you are the most important person in your parents' hearts. They are the 1 people to you in the world. However, many teenagers like you have trouble 2 with their parents. They always complain (抱怨) that their parents say too much instead of listening to what they're thinking. When they do something wrong, getting away from parents seems to be the only 3 . In fact, what your parents do just shows love for you. They love you more than they love 4 . Whenever you need help, they are always there, standing by you. Try to put yourself into their shoes, and you'll understand them 5 . （二） Co-operation(合作) is always needed when you make a project that the teacher gives you. First, discuss all you would like to do With your classmates. Choose one of the members to write down what you're talking about. Then, with the ideas you get, list all you want. Everyone shares the duty for the project. You can collect information not only from books but also on the In ternet. Making a survey (调查) and doing a research are also good ways. After that, all the members put what has been found together. Try to make the project more well-organized. In the end, you can give a report in front of your class to show the results of your hard work. | |
| 任务1：用方框中所给词的适当形式填空，使文章通顺、连贯、合理。（每空一词，每词限用一次） l.____2.____3.____4.____5.____ 任务2：根据英文释义及首字母提示拼写单词。 6. i____plan; opinion 7. s____use, pay or have something with others 任务3：同义句转换，每空一词。 You can collect information not only from books but also on the Internet. You can collect information 8. ___ from books 9. _ on the Internet. 任务4：根据短文内容回答问题。 What can you give in front of your class to show the results of your hard work? 10 .______________________________________________________________ | |