问题 单项选择题

下面有关索引的描述正确的是

A.建立索引以后,原来的数据库表文件中记录的物理顺序将被改变

B.索引与数据库表的数据存储在一个文件中

C.创建索引是创建一个指向数据库表文件记录的指针构成的文件

D.使用索引并不能加快对表的查询操作

答案

参考答案:C

解析: 本题考查考生对索引的理解。选项A是错误的,当建立索引表之后,原来数据库表文件中数据记录的物理顺序是不会因为建立索引而被改变的,即建立索引不会影响原有数据表中记录的排列次序。选项B也是错误的,索引文件和数据库表的数据分别存储在两个不同的文件之中,不能混为一谈。选项D错误的原因是,否定了索引文件的作用,要清楚建立索引的一个目的就是加快对表的查询。

阅读理解

阅读理解。

     Pit-a-pat. Pit-a-pat. It's raining. "I want to go outside and play, Mum," Robbie says, "When can the rain

stop?" His mum doesn't know what to say. She hopes the rain can stop, too. "You can watch TV with me,"

she says. "No, I just want to go outside." "①Put on your raincoat." "Does it stop raining?" "No, but you can

go outside and play in the rain. Do you like that?" "Yes, mum." He runs to his bedroom and puts on his red

raincoat. "Here you go. Go outside and play." Mum opens the door and says. Robbie runs into the rain. Water

goes ②here and there. Robbie's mum watches her son. He is having so much fun. "Mum, come and play with

me!" Robbie calls. The door opens and his mum walks out. She is in her yellow raincoat. Mother and son are

out in the rain for a long time. They play all kinds of games in the rain.

1. What does Robbie want to do on the rainy day?

A. Help his mother.

B. Watch TV.

C. Wear his raincoat.

D. Go out.

2. What does the underlined phrase (短语) mean in Chinese?

A. ①放上②到处

B. ①穿上②这里和那里

C. ①穿上②到处

D. ①放上②这里和那里

3. Robbie has a _____ day that day.

A. happy

B. scary

C. dangerous

D. boring

4. Which of the following is TRUE according to the passage?

A. The raincoat can stop the rain.

B. Robbie's mum doesn't wear a raincoat in the rain.

C. Robbie first watches TV with his Mum

D. The color of Robbie's raincoat is red.

5. Which is the best title(标题)for the passage?

A. It's raining

B. Fun in the rain

C. Robbie and His mother

D. Robbie's raincoat

判断题