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问题 填空题

面向对象技术的复杂对象构造能力，突破了关系模型的______不可再分的限制。

答案

参考答案：属性或字段

解析： 面向对象技术的复杂对象构造能力，突破了关系模型．的属性不可再分的限制。复杂对象类型是有多种基本的或用户定义的类型构成的对象类型，主要的类型构造器为：组合、集合和引用。

阅读理解

I'm Tina. My mother is a tall woman. She is very patient. She teaches in a high school and her students love her. They often visit our home and sometimes bring her some flowers. My mother is also a wonderful cook. She cooks different dishes for me every day.
I'm Jack. My grandpa is short and strong. He often wears a pair of glasses and he likes reading newspapers after dinner. My grandpa is always a person to put everybody else first. He tries his best to make us happy or to help us. In 1991, my grandpa found out he was ill, but he didn't tell anybody. He kept it to himself. He owns a bookshop and spends more time with his family.
I'm Leo. I have a lot of friends, but I have only a few good friends. One of them is my best friend. We are both twelve years old. He is fat and tall. He likes to eat oranges and meat. He is a nice boy and good at Maths. He likes playing football and basketball. I enjoy playing with him because I can learn a lot from him.
小题1: What does Tina's mother look like?
A．She is tall.B．She is short.C．She is strong.D．She is fat.
小题2:When Jack's grandpa found out he was ill, what did he do?
A．He kept it as a secret.
B．He cooked different dishes to others.
C．He went to hospital.
D．He traveled to other cities.
小题3:We can know from the passage that Leo
A．is fat and tallB．likes eating oranges and meat
C．is good at MathsD．is a 12-year-old boy
小题4:Why does Leo enjoy playing with his best friend?
A．Because his friend is very funny.
B．Because he can learn a lot from him.
C．Because his fiend can buy a lot of snacks.
D．Because they both like reading books.
小题5:The writer wrote the passage to ______.
A．teach us a lessonB．protect something
C．surprise someoneD．introduce some people
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解答题

（8a2﹣3ab﹣5b2）﹣（2a2﹣2ab+3b2）
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