阅读理解C
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 mail carrier, brings mail to a large office building in Washington D.C. He is one of the 250 mail carriers in the United States.
Mr. Leachim, who weighs 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, the parents’ names and what each child knows and needs to know. In addition(另外), 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 number. His computer brain puts the child’s voice and number together. He identifies the child without mistakes. Then he starts the lesson.
Another advantage is that Mr. Leachim is flexible. If 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 can help people in many different ways

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

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

Mr. Leachim’s ________ makes him a good teacher.

A．advantages

B．knowledge

C．appearance

D．energy

The word “flexible” in the last paragraph means ________.

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

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