问题 应用设计题

在图所示的电路中,有两根导线尚未连接,请用笔线代替导线连接电路,要求:L1和L2并联,电键S控制L1,电流表测L2的电流。并请标出电源的“+”、“-”。

答案

题目分析:根据题意,电流表与被测的L2串联,开关与被控制的L1串联.原图已把电流表的负接线柱连到电源的左极上,电流表的正接线柱连到灯L2的接线柱上,电键S已和L1连接;要求灯L1和灯L2并联,故将灯L1和灯L2连接在一起的两接线柱中选择一接线柱连接导线到电源的右接线柱,电键S的左接线柱连电源的左接线柱;根据电流从电流表正接线柱流入,负接线柱流出,确定电源的正负极。如下图:

阅读理解

阅读理解。

     Last week, Richard's wife Leila had an accident. Richard's youngest child, John, was at home when it

happened. He was playing with his new toy car. Richard had given it to him a week before, for his third

birthday.

    Suddenly John heard his mother calling "Help! Help!" He ran to the kitchen. His mother had burned herself

with some hot cooking oil (油). She was crying and the pan (锅) was on fire.

     Richard had gone to his office. Both the other children had gone to school. John was too small to help his

mother. __________. She soon put out the fire and took Leila to the hospital. When Richard came, Leila told

him what had happened. He was very proud of his son. "When you are a man, you will be just like your father,"

he said.

1. How old was John in this story?

A. One.

B. Two.

C. Three.

D. Five.

2. How many people were there in their family?

A. Three.

B. Five.

C. Six.

D. Seven.

3. Choose the right sentence to fill the blank (空白处) in the passage.

A. The whole kitchen was on fire

B. But John telephoned his father

C. John stood there not knowing what to do but crying

D. But he ran to the neighbour's house and asked her for help

4. Which is the right order (顺序) according to the passage?

a. Leila had an accident.

b. John got his present, a new toy car.

c. Richard was very proud of his youngest son.

d. John heard his mother calling "Help! Help!"

A. a-b-c-d

B. b-a-d-c

C. c-a-b-d

D. c-b-a-d

5. What's the best title of this passage?

A. A son to be proud of

B. A little boy and his mother

C. An accident

D. A proud father

单项选择题