Sam is a teacher of maths. He is not young, but he is not old. He is 40 years old. He has a round face and black hair. He is short. There are 45 students in his class. They all like him.

Now it’s in the afternoon. Look, the students are studying in the classroom. Sam is there, too. He is helping them to study maths. He is a good teacher, and he is a good friend of his students.

1.What does Sam do?

A He is a worker.

B He is a teacher.

C He is a doctor.

D He is a nurse.

解析：选B。B细节理解题。根据Sam is a teacher of maths.可知山姆是一个数学老师，故选B。

2.What colour is his hair?

A It’s black.

B His hair is white.

C It is brown.

D He has yellow hair.

解析：选A。A细节理解题。根据He has a round face and black hair.可知他的头发是黑色的，故选A。

3.How many students are there in his class?

A Forty.

B Fortieth.

C Four.

D Forty-five.

解析：选D。D细节理解题。根据There are 45 students in his class.可知他的班上有45名学生，故选D。

4.What are the students doing in the classroom?

A They are walking there.

B They are doing their lessons.

C They are helping their teacher.

D They are good friends of Sam.

解析：选B。B细节理解题。根据Look, the students are studying in the classroom.可知学生正在教室学习，故选B。