问题 实验题

在“探究加速度与物体质量、物体受力的关系”的实验中,按实验要求装好器材后,应按一定步骤进行实验,下述操作步骤的安排顺序不尽合理,请将合理的顺序以字母代号填写在下面的横线上:____。

A.保持托盘和砝码的质量不变,在小车里加砝码,测出加速度,重复几次

B.保持小车质量不变,改变托盘中砝码的质量,测出加速度,重复几次

C.用天平测出小车和托盘的质量

D.平衡摩擦力,使小车近似做匀速直线运动

E.挂上托盘,放进砝码,接通打点计时器的电源,放开小车,在纸带上打下一系列的点

F.根据测量的数据,分别画出a-F和图线

答案

CDEABF或CDEBAF

阅读理解

Jim was a 15-year-old boy living with his little sister, Joy. Their parents had passed away long ago. Jim took care of Joy by himself.

One day, Jim woke up at 3 in the morning as usual. When Joy was sleeping alone, Jim left their little house to deliver newspapers. As he did so, he found something unusual. One man was sitting in front of Jim’s house. Jim was so surprised that he stopped to look at him closely. It was an icy morning and he looked very old.

The poor old man didn’t have anything to cover himself with. Jim went into his house to get the old man a blanket(毯子). However, there were no extra blankets, so Jim thought hard and took his father’s coat. It was the only thing of his father’s that he had left. Jim wrote a short note. “Sir, I found you sleeping in front of my house. This is my father’s coat. I hope it fits you well.” He put the note in a pocket of the coat, and covered the old man with the coat. Then he went to work. When he came back three hours later, both the man and the coat were gone. Jim thought that it was the best thing he could have done with his father’s coat.

That afternoon, Jim hurried home after school because Joy was at home alone. However, Joy and the old man were standing in front of the house, and Joy shouted to Jim, “Brother!He’s our grandfather!”

The grandfather smiled and said, “Jim, I have been looking for you all around the country for eight years. I’m not rich. But I can take care of you two. Thank you for giving me the coat and letting me know what a good person my grandson is. This coat was the very one that I gave my own son, a long time ago.”

小题1:Jim looked after his little sister by himself because ________.

A.they were too poor

B.their grandfather left them

C.he was old enough

D.their parents had died小题2: Jim got up early in the morning to ________.

A.take care of his sister

B.deliver newspapers

C.sit in front of the house

D.find something unusual小题3: What did Jim do when he saw an old man was sitting in front of his house?

A.He took a blanket and gave it to him.

B.He took his father’s coat to cover him.

C.He stopped and talked to him.

D.He wrote a letter to the police.小题4: When Jim came back home that afternoon, Joy told him that ________.

A.the old man was their grandpa

B.the old man and the coat were gone

C.their grandpa was looking for them

D.she couldn’t find their father’s coat小题5: Which of the following is NOT true about the old man?

A.He was happy to find his grandchildren.

B.He thought Jim was a good boy.

C.He was poor and could not take care of them.

D.The coat helped the old man find his grandchildren.小题6: The best title of the passage is “________”.

A.Jim and Joy

B.A newspaper boy

C.An icy morning

D.Father’s coat

单项选择题