Robots are smart. With their computer brains, they help people work in dangerous places or do difficult jobs. Some robots do regular jobs. Bobby, the robot mail carrier, brings mail to a large office building in Washington, D.C. He is one of 250 robot mail carriers in the United States. Mr. Leachim, who weights two hundred pounds and is six feet tall, has some advantages as a teacher. One is that he does not forget details. He knows each child’s name, their parents’ names, and what each child knows and needs to know. In addition, he knows each child’s pets and hobbies. Mr. Leachim does not make mistakes. Each child goes and tells him his or her name, then dials an identification (识别) number. His computer brain puts the child’s voice and number together. He identifies the child with no mistakes.
Another advantage is that Mr. Leachim is flexible. If the children need more time to do their lessons they can move switches. In this way they can repeat Mr. Leachim’s lesson over and over again. When the children do a good job, he tells them something interesting about their hobbies. At the end of the lesson the children switch Mr. Leachim off.
The first paragraph of the passage tells us

A．human beings are not as smart as robots

B．robots will take the place of man to rule the earth

C．we can only use robots to do some regular jobs

D．robots can help people in many different ways

What is the most important thing Mr. Leachim can do in his lessons?

A．To meet the needs of each student.

B．To talk to the students in different languages.

C．To keep everyone’s interest in his lessons.

D．To introduce more hobbies to the children.

The underlined word “flexible” probably means

A．not strict	B．not hard
C．suitable	D．changeable

Which of the following statements may be TRUE according to the passage?
A. There are 250 robot teachers in the United States.
B. Mr. Leachim is run and controlled by electricity.
C. Bobby works in a large office building in Washington D.C.
D. The lessons taught by Mr. Leachim are given on a TV set.