阅读理解。
Peter wondered why he didn't have many friends. The reason was he was always taking, never giving.
One day Peter told Bill, "I'd like to give a party on Saturday, I'd like you to come and bring Martha, too."
"Thanks, Peter. We'd be happy to come" "Perhaps you'd like to bring your violin. You and Martha sing well
together. I'm sure everyone will want you to sing for us."That was how Peter began to plan his party. Next
he asked another friend, Betty, to bring a cake."You make the best cake in the world, Betty, and I like to eat
your cake better than have one from the bakery."Peter invited a few other friends to come to his party. He
didn't forget to ask something from each one of them. He even asked Jim and Mary Jackson to let him give
the party at their house!
The party was a big success. However, as the guests were leaving, they said "Thank you" to Bill and
Martha for the music, Betty for tile cake, the Jacksons for the use of the house and to others for their hard
work. To Peter they just said, "Thanks for the invitation."
1. The party was held ________.
A. at Peter's house
B. in a large hall
C. at Peter's friend's house
D. in a secret place
2. Which of the following is not true?
A. Betty made the best cake.
B. Mary Jackson sang well.
C. Bill played the violin well.
D. The Jacksons did hard work for the party.
3. ________ liked Peter.
A. Many of his friends
B. Few people
C. Everyone
D. All his friends
4. Peter ________ to give the party.
A. tried his best
B. did nothing
C. only invited some friends
D. did everything
5. From the story, we can see Peter was ________.
A. a warm-hearted man
B. good at making friends
C. a selfish man
D. a welcomed friend
最小，滑动触头在b端时，电路与在a端情况相同，路端电压也是最小，所以从a端滑到b端，电压表测量的路端电压从最小变为最小，所以是先增大后减小，选项CD错。滑动触头在a端时，电流表与滑动变阻器串联被短路，电流为0，为最小值，所以从a端滑到b端电流只可能增大不可能再减小，选项A对B错。