Once upon a time, two brothers who lived on neighboring farms fell into conflict(冲突) . It was the first serious one between them in 40 years of farming peacefully side by side. In the end, they fell apart.
One morning, a man with a carpenter’s toolbox came for some work. The elder brother said, “I have a job for you. Look at the farm across the creek（河沟）. My younger brother lives there. It was he who used his bulldozer（推土机）to dig the creek last week to spite(刁难) me. So I want you to build me a fence, an 8 – foot – high fence, in order not to see his place any more.” The carpenter smiled and said, “I see. I’ll try to do a job that satisfies you.” Then the elder brother went downtown.
At sunset when the farmer returned, the carpenter had just finished his job. The farmer’s eyes opened wide! To his surprise, there was no fence there at all! Instead, there was a bridge stretching from one side of the creek to the other! A fine piece of work! He saw his younger brother coming to him with the hands outstretching. The brothers stood at each end of the bridge, and then they met in the middle, taking each other’s hands. They turned to see the carpenter lift his toolbox on his shoulder.
“No, wait! Stay a few days. I’ve a lot of other work for you,” said the elder brother.
“I’d love to stay on,” the carpenter said, “but I have so many more bridges to build.”
1．What was the life like for the two brothers before the conflict?
A．They lived a poor life. B．They lived in peace.
C．They never spoke to each other. D．They lived on the same farm.
2．It can be learned that the carpenter was ________.
A．unwilling to obey the farmer B．fond of building bridges
C．unable to build a fence D．willing to help others
3．The best title for this passage is ________.
A．A Fine Piece of Work B．A Carpenter
C．A Conflict between Two Brothers D．Two Brothers
4．Which of the following is true according to the passage?
A．The elder brother used his bulldozer to dig a creek.
B．The elder brother helped the carpenter build the bridge.
C．The brothers were both satisfied with the carpenter’s work.
D．The carpenter planned to build an 8-foot - high fence as asked to.
，量程0.5A的电流表
（具有一定内阻），固定电阻
，把两组数据分别带入公式组成方程组，求解即可