问题 实验题

小王同学在“测定小灯泡的电功率”实验中,所用电源电压不变,滑动变阻器上标有“20W 2A”字样,小灯标有“0.3A”字样,估计小灯的额定功率在1.2瓦以上。他正确连接电路,实验步骤正确,闭合电键时,电压表示数如图(a)所示,电流表示数为0.2安,此时小灯发光较暗。接着他移动变阻器的滑片直至小灯正常发光,电压表的示数如图(b)所示。他继续移动变阻器的滑片到端点时,电流表的示数为

0.32安,小灯比正常发光时要亮。请将下表填写完整并计算出小灯的功率。

    

答案

完形填空

[1]A homeless man who wanders around in the streets of the Bronx singing soft R&B songs has become famous thanks to his talent and YouTube.

[2]James Percell, 49, was discovered by music manager, Kenneth Williams, who decided to help him get off the streets. In one video, Kenneth Williams speaks to the camera and explains ______________.  "I went to the Bronx to visit my family, and I ran into this homeless brother," he says. "His voice is very beautiful."

[3]Mr. Percell has become famous on YouTube, where more than a million people have heard his golden voice, and many producers and filmmakers have already expressed their eagerness to work with him.

[4]Mr. Percell says he has been homeless for a few years and neglects everything for the love of music in an attempt to develop his career, he has cried out for The Voice and the X- Factor singing competitions. But the judges didn’t contact him after they found out that he was homeless.

[5]He now has a MySpace page and Facebook fan page, which are used to share his songs with his fans. He has written many songs, one of which is Everything Must Change, written for Michael Jackson. He hopes that his songs will help the world know his story and life struggle to make it as a singer, and also hopes that social media can give him a fighting chance to finally make his dream come true.

小题1:What has made James Percell famous?(no more than 8 words)

______________________________________________________________________

小题2:Fill in the blank with the appropriate words.(no more than 5 words)

In one video, Kenneth Williams speaks to the camera and explains _______________________________.

小题3:What is the main idea of the third paragraph?(no more than 7 words)

_______________________________________________________________________

小题4:Why did the judges from some singing competitions refuse to contact James Percell?

(no more than 5 words)

_________________________________________________________________________

小题5:What does the word "which" probably refer to?(Line 2, Paragraph 5)

(no more than 6 words)

单项选择题