题目

在“测量小灯泡功率”的实验，小灯泡额定电压为2.5V，额定功率不超过1W． （1）请你用笔画线代替导线，将图甲实物电路连接完整． （2）连接好电路，闭合开关前，滑片应处于     （“A”、“B”）端，闭合开关S后，小灯泡发光，但电压表无示数．经检查，图a、b、c、d四根导线有一根断了，则该导线是    （填写字母）． （3）排除故障后，闭合开关，测量小灯泡额定功率，移动变阻器的滑片P，眼睛应先注视  表的示数，然后读出另一电表示 This is the true story of a great woman. Her name was Helen Keller. She was born in 1880 in Alabama in the USA. When Helen was one year and a half, she got ill and then she became blind(瞎的) and deaf(聋的).Her parents tried to do their best for their daughter and they asked a young teacher called Anne Sullivan to their home to teach Helen. Anne herself was almost blind in her youth. Helen was a smart girl but she couldn’t hear or talk. She was angry at this. So she was always crying and shouting. Then Anne often went for walks with Helen in the country near her home. After two weeks, Helen became quiet. Anne began to teach her how to spell and Helen learned to write. Boards(木板) with lines on them helped her to keep the words straight. Soon her talents were famous all over the world. There were her stories in newspapers and magazines. By the time she was 17, she was studying French, German, Latin, physics and many other subjects. She was still blind and deaf. In 1902, she wrote a book The Story of my life. It became well-known all over the world.1.Helen became blind and deaf when she was ___________.A.one year old B.half a year oldC.one year and a half old D.two years old2.Why was Helen always crying and shouting? A.Because she couldn’t hear and talk.B.Because she felt lonely.C.Because she was angry with Anne.D.Because Anne always went out with her.3.Anne taught Helen how to __________.A.run B.speak and writeC.play football D.swim4.Why did Helen need to use special boards to write on?A.Because she didn’t like desks.B.Because she didn’t have desks.C.Because boards with lines on them helped her to keep the words straight.D.Because she liked to use them.5.How old was Helen when she finished the book The Story of my life?A.51. B.42.C.22. D.17.