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

不使驾驶员操纵方向盘感到困难的平曲线最小长度为计算行车速度的（）行程。

A．3s；

B．5s；

C．6s；

D．9s