阅读理解。

     There is a big store near our school.  It sells a lot of things. Many of the teachers and students like to do

shopping there. You can buy food there, like something to eat or something to drink. You can buy school

things there, too. Some of them are very cheap. The people in the shop are very friendly. It opens at 8 in the

morning and closes at 6 in the afternoon.

1. There is a big shop ______.

A. in our school

B. near their school

C. near our school

D. in their school

2. You can buy ______ there.

A. a bus

B. a car

C. a plane

D. an eraser

3. There aren't ______ in the shop.

A. pencils

B. soccer balls

C. fruits

D. dogs

4. The people in the shop are ______ .

A. friends

B. student

C. teachers

D. friendly

5. It's open for ______ hours a day.

A. 8

B .9

C. 10

D. 11

对具有相同关键字的关系模式，如果他们的处理主要是查询操作，且常在一起，可将这列关系模式进行什么操作

A) 模式评价
B) 优化模式
C) 合并
D) 分解