问题 问答题

在“测定匀变速直线运动的加速度”的实验中,电火花计时器是用于测量______的仪器,工作电源是______(填“交流电”或“直流电”),电源电压是______v,相邻打点时间间隔是______s.

答案

电火花计时器接220V交流电压,产生的电火花的频率是50Hz,所以点与点时间间隔为0.02s.

故答案为:时间;   交流电;   220;   0.02;

阅读理解

There was an American writer who often told such a story to his friends and readers:

It was an exhibition of the artists’ works organized by the Red Cross. I was invited as a special guest to take part in the exhibition. During this period, two cute girls of 16 or 17 years old came to me and asked for my signature(签名).

“I haven’t brought my pen. Is the pencil okay?” I asked. In fact I knew they wouldn’t refuse. I just wanted to show a well-known writer’s good manners to the common readers.

“Certainly,” the young girls readily agreed. I could see they were very excited. Of course, their excitement also made me more pleased with myself. One of the girls handed her notebook to me. I took out my pencil, wrote a few words of encouragement, and signed my name. The girl read my signature, frowned(皱眉), looked at me carefully and asked, “Aren’t you Robert Charboss?”

“NO,”I told her proudly, “I’m the author of Alice Adams, the winner of two Pulitzer Prizes.”

The young girl turned to another one, and said, “Mary, lend your eraser to me.”

At the moment, all my pride turned into a bubble (泡沫) immediately. Since then, I always warn(告诫)myself:Don’t think too highly of yourself even though you are so outstanding(杰出的).

小题1:The writer went to the exhibition because he      .

A.would put out his new book

B.got a special invitation

C.wanted to meet his fans

D.wanted show off (炫耀) that he was an outstanding writer小题2:We can infer that the two girls were the fans of   .        

A.the writer

B.Alice Adams

C.Robert Charboss

D.the Red Cross小题3:The underlined sentence “all my pride turned into a bubble immediately” means that the writer     .

A.had realized that he was too proud of himself

B.felt very angry when he heard the girl’s words

C.was so polite to the girls and helped them a lot

D.was regret to sign his name for the girl小题4:This story teaches us to be a(an)    person.

A.careful

B.outstanding

C.modest

D.easy-going

单项选择题