阅读理解。

     This is a picture of a classroom (教室). The classroom is big (大的) and clean. You can see (看见) a

teacher's (教师的) desk, five desks and six chairs. You can see a girl and a boy, too. Three books are on the

teacher's desk. A pencil case is on the desk. Two pens and two rulers are in the pencil case. A school bag is

under a chair. A ball is on the floor. The girl is Linda; she is 11. The boy is Mike; he is 12. They are in Class

Two, Grade One. They are friends. The teacher is Miss Green. She is not here.

1. It's a picture of  ________.

A. boys and girls

B. desks and chairs

C. a classroom

2. The two pens are ________.

A. in the pencil case

B. on the teacher's desk

C. on the floor

3. ________ is eight+three.

A. Linda

B. Mike

C. Miss Green

4. ________ is not in the picture.

A. Mike

B. Miss Green

C. Linda

5. Mike and Linda are ________.

A. teacher and student (学生)

B. brother and sister

C. good friends

从有n个结点的顺序表中删除一个结点平均需要移动的结点个数是　　【3】　　。