问题 单项选择题

学生、课程和成绩三个关系:学生(学号,姓名,性别,班级),课程(课程名称,学时,性质),成绩(课程名称,学号,分数),若打印学生成绩单,包含学号、姓名、课程名称、分数,应该对这些关系进行( )操作。

A.并

B.交

C.乘积

D.连接

答案

参考答案:D

阅读理解

根据短文内容,判断句子正“T”、误“F”。 

     An old man was sitting in front of his house. Just then, a young man walked up to him, "Excuse me, 

what kinds of people live in this town?" asked the young man.       

     "What kinds of people lived in the town you left?" the old man, replied with a smile. "Oh,  they were

 unkind and angry. I couldn't wait to leave. "said the young man."Then those are exactly the same kinds

 of people you will find in this town. You might not be happy here."After     hearing his words, the young

 man moved on.       

     About an hour later, another young man walked to the old man with a big smile on his face."Good 

afternoon, sir. Could you tell me what kinds of people live in this town?" the young man asked. "What 

kinds of people lived in the last town you lived in?" the old man asked. "Oh, they were amazing! They 

were polite and helpful. I really didn't want to leave," answered the young man."You'll find the same kinds of people in this town…Welcome! I hope you decide to stay here."    

( )1. The old man was playing chess when a young man walked to him.                  

( )2. The first young man wanted to ask him the way to the nearest town.              

( )3. The second young man was from a town where people were very polite and helpful.

( )4. The first young man decided to stay after hearing the old man's answer.        

( )5. The old man hoped the second young man would live in his town.                  

问答题