问题 单项选择题

实体是信息世界中广泛使用的一个术语,它用于表示

A.有生命的事物

B.无生命的事物

C.实际存在的事物

D.一切事物

答案

参考答案:C

解析: 实体是客观存在且可以相互区别的事物。实体可以是具体的对象,如一个学生,也可以是一个抽象的事件,如一次出门旅游等。因此,实体既可以是有生命的事物,也可以是无生命的事物,但它必须是客观存在的,而且可以相互区别。

阅读理解

阅读理解

     I began working in journalism(新闻工作)when I was eight. It was my mother's idea. She wanted me

to "make something" of myself,  and decided I had better start young if I was to have any chance of

keeping up with the competition.

     With my load of magazines I headed toward Belleville Avenue. The crowds were there. There were

two gas stations on the corner of Belleville and Union. For several hours I made myself highly visible,

 making sure everyone could see me and the heavy black letters on the bag that said THE SATURDAY

EVENING POST. When it was supper time, I walked back home.

     "How many did you sell,  my boy?" My mother asked.

     "None."

     "Where did you go?"

     "The corner of Belleville and Union Avenues."

     "What did you do?"

     "Stood on the corner waiting for somebody to buy a Saturday Evening Post."

     "You just stood there?"

     "Didn't sell a single one."

     "My God, Russell!"

     Uncle Allen put in, "Well,  I've decided to take the Post." I handed him a copy and he paid me a

nickle(五分镍币). It was the first nickle I earned.

     Afterwards my mother taught me how to be a salesman. I would have to ring doorbells, address

adults with selfconfidence(自信),  and persuade them by saying that no one, no matter how poor,  

could afford to be without the Saturday Evening Post in the home.

     One day, I told my mother I'd changed my mind. I didn't want to make a success in the magazine

business.

     "If you think you can change your mind like this," she replied, "you'll become a goodfornothing." She

insisted that, as soon as school was over, I should start ringing doorbells, selling magazines. Whenever

I said no, she would scold me.

     My mother and I had fought this_battle almost as long as I could remember. My mother,  dissatisfied

with my father's plain workman's life,  determined that I would not grow up like him and his people. But

never did she expect that,  forty years later,  such a successful journalist as me would go back to her

husband's people for true life and love.

1. Why did the boy start his job young?

A. He wanted to be famous in the future.

B. The job was quite easy for him.

C. His mother had high hopes for him.

D. The competition for the job was fierce.

2.  From the dialogue between the boy and his mother, we learn that the mother was________.

A. excited  

B. interested

C. ashamed  

D. disappointed

3. What did the mother do when the boy wanted to give up?

A. She forced him to continue.

B. She punished him.

C. She gave him some money.

D. She changed her plan.

4.  What does the underlined phrase "this battle" (last paragraph) refer to?

A. The war between the boy's parents.

B. The argument between the boy and his mother.

C. The quarrel between the boy and his customers.

D. The fight between the boy and his father.

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