某一电学黑箱内可能有电容器、电感线圈、定值电阻等元件，在接线柱间以如图所示的“Z”字形连接（两接线柱间只有一个元件）．为了确定各元件种类，小华同学把DIS计算机辅助实验系统中的电流传感器（相当于电流表）与一直流电源、滑动变阻器、开关串联后，分别将AB、BC、CD接入电路，闭合开关，计算机显示的电流随时间变化的图象分别如图a、b、c所示，则如下判断中正确的是（ ）
A．AB间是电容器
B．BC间是电感线圈
C．CD间是电容器
D．CD间是定值电阻
由图a看出，a接入电路时有瞬间的电流，电容器充电过程有短暂的电流，电路稳定后电路中没有电流．说明AB间是电容器．由b图看出，此元件接入电路时，电流逐渐增大，是由于线圈中产生自感电动势的阻碍作用，电流只能逐渐增大，说明BC间是电感线圈．从c图看出，此元件接入电路时电流恒定不变，说明CD是定值电阻．
故选ABD
| 阅读理解。 |
| Dick lived in England. One day in January he said to his wife, "I'm going to fly to New York next week because I've got some work there." "Where are you going to stay there?" his wife asked. "I don't know yet." Dick answered. "Please send me your address from there in a telegram (电报)," his wife said. "All right," Dick answered. He flew to New York on January 31st and found a nice hotel in the center of the city. He put his things in his room and then he sent his wife a telegram. He put the address of his hotel in it. In the evening he didn't have any work, so he went to a cinema. He came out at nine o'clock and said, "Now I'm going back to my hotel and have a nice dinner." He found a taxi (出租车) and the driver said, "Where do you want to go?" But Dick didn't remember the name and address of his hotel. "Which hotel are my things in?" he said, "And what am I going to do tonight?" But the driver of the taxi did not know. So Dick got out and went into a post office. There he sent his wife another telegram, and in it he wrote, "Please send me my address at this post office." |
| 1. Dick flew to New York because . |
[ ] |
| A. he went there for a holiday B. he had work there C. he went there for sightseeing (观光) D. his home was there |
| 2. Why did his wife want a telegram from him? |
[ ] |
| A. Because she didn't know his address yet B. Because she wanted to go to New York, too C. Because she might send him another telegram D. Because she couldn't leave her husband by himself in New York |
| 3. Where did Dick stay in New York? |
[ ] |
| A. In the center of the city. B. In a hotel. C. In a restaurant. D. At his friend's house. |
| 4. Who would send him the name and address of his hotel? |
[ ] |
| A. The manager (经理) of his hotel. B. The police office. C. The taxi driver. D. His wife. |
| 5. Which of the following is not true? |
[ ] |
| A. Dick stayed at a nice hotel in the center of the city. B. Dick didn't work on the first night of his arrival. C. Dick forgot to send his wife a telegram. D. Dick wanted to go back to his hotel in a taxi. |