问题 多选题

下列情形中可以看作质点的是(  )

A.研究冠军郭晶晶在跳水比赛中时

B.研究奥运会冠军刘翔跨栏动作时

C.研究动车组列车从温州南到福州所需的时间

D.研究小行星“孙义燧星”绕太阳的公转周期

答案

A、郭晶晶在跳水比赛时,由于要看人的身体各部分的动作如何,不能看成质点,所以A错误;

B、研究奥运会冠军刘翔跨栏动作时,不能把人看成质点,所以B错误;

C、研究动车组列车从温州南到福州所需的时间,列车的长度可以忽略,可以看成质点,所以C正确;

D、研究小行星“孙义燧星”绕太阳的公转周期,小行星的体积是可以忽略的,可以看成质点,所以D正确.

故选CD.

阅读理解

Mr Reese was born in a big city. His father had several companies and got a lot of money. He could give his son all the young man wanted. He was busy with his business and never asked him how he got along with his studies. So the boy spent most time in the restaurants or cinemas. Of course he was weak at his lessons and learned nothing at school. He made many friends but none of them was good and when they knew he came from a rich family, they began to teach him to gamble(赌博). Of course he lost much money.

Now Mr Reese was twenty and finished middle school. He could not do anything. But his father didn't mind it until one day he found the young man had sold one of his companies. He became so angry that he made him leave his house. The young man couldn't gamble any longer. His friends made him pay his debt. He had to ask his mother to help him and the woman often gave him some money. But one evening his father happened to find it. The old man stopped his wife from doing so. They began to fight in the room. The young man brought out a knife and killed his father. His mother helped him to run away, but soon after that he was caught and sentenced(判刑)to death.

It was a cold and wet day. Suddenly it began to rain hard when Mr Reese was being sent to the execution ground(刑场). Soon both he and the soldiers were wet through. He said angrily, “Bad luck! I shall be shot in such bad weather!”

“Don't complain(抱怨), brother, ”said one of the soldiers. ‘You're luckier than us all. We'll have to go back to the city after that!”

小题1:Old Reese never wanted to know about his son's studies because ____.     [    ]

A.he was sure his son was good at his lessons

B.he spent all his energies on his business

C.he knew nothing about the education

D.his wife looked after their children小题2:The bad young men taught Young Reese to gamble in order ____.      [    ]

A.to play with him

B.to spend spare time

C.that the could get much money from him

D.that they could find jobs in his father's companies小题3: Old Reese became angry because ____.       [    ]

A.his son had learned nothing at school.

B.his son was weak at all his lessons

C.his son couldn't do anything in the companies

D.his son had lost one of his companies小题4: Mr Reese complained ____.   [    ]

A.he was sentenced to death

B.he would be shot

C.he went to the execution ground on foot

D.he would be shot in bad weather

单项选择题