题目

测量视力时，利用平面镜成像特点可以节省空间，如图所示，让被测者面对镜子背对视力表，人距平面镜2m，距身后的视力表1m.此人看到视力表的像离他的距离是（） A . 3m B . 4m C . 5m D . 6m 答案：C短文改错 Dear Peter, 　 　　I'm writing to ask you some advice. Babara 1．________ and me are getting very worried about Tom. He 2．________ has been staying out very late at night or is 3．________ always so tired to do well in school. He wouldn't 4．________ listen anything we say. We have tried not to 5．________ give him pocket money, and it doesn't do any good. 6．________ I'm afraid he is sure of that we are just trying 7．________ to make him to do what we want to prove(证明) 8．________ we are strong, but the fact is that we were worried 9．________ about his future. I know you and Kate can help me. 10．________ Any advice would be very welcome. 　 Yours, Mike