问题 选择题

一人站在平面镜前30cm处看到了自己的全身像,当人在向平面镜走近过程中,下列不发生变化的是(  )

A.像的大小

B.人到镜的距离

C.像到镜的距离

D.人到像的距离

答案

因平面镜成的像是等大的,因此当人在向平面镜走近过程中,人到镜的距离减小,像到镜的距离减小,则人到像的距离减小,而人在平面镜中的像大小不变.

故选A.

单项选择题
句型转换

句型转换:将直接引语改为间接引语。

1. She said,"I will give her some advice tomorrow.”  

    She said                                               

2. "You" have already done your duty,"he said to her.    

    He told her                                              

3. Mary wrote in her letter, "Mr. Liu, where will you come to America?"    

    Mary wrote to ask Mr. Liu                                              

4. Don't risk your lives,men!"the captain warned.

    The captain warned the men                                               

5. "How many times have you heen here?"he asked.    

     He asked me                                              

6. She said," We have worked on the school farm for two weeks.”    

    She said                                               

7. "You should be more careful next time," his father said to him.   

    His father told him                                               

8. Mr. Wang said,"I will leave for Sharighai on business next month ,children.”

    Mr. Wang told the children                                              

9. I haven't heard from my parents these days," said Mary.    

    Mary said                                               

10. The geography teacher said to us, "The moon moves around the earth and the earth goes round the sun.”  

     The geography teacher told us