School education(教育) is very important and useful. Yet, no one can learn everything from school. A teacher, no matter how much he knows, can not teach his students everything they want to know. The teacher’s job is to show his students how to learn. He teaches them how to read and how to think. So, much more is to be learned outside school by the students themselves.
It is always more important to know how to study by oneself than to memorize some facts or a formula（公式）. It is actually quite easy to learn a certain fact in history or a formula in math. But it is very difficult to use a formula in working out a math problem.
Great scientists didn’t get everything from school. For example, Edison didn’t even finish primary school. But they were all so successful. They invented so many things . The reason for their success was that they knew how to study. They read books that were not taught at school. They would ask many questions as they read. They did thousands of experiments. They worked hard all their lives, wasting not a single moment. Above all, they knew how to use their brain.
 According to the passage, the most important thing a teacher should do is _______.

A．to teach his students everything he knows

B．to teach the students how to think

C．to know everything they want to know

D．to teach the students how to work out a math problem

To work out a math problem, you need to know _________.

A．a certain formula	B．a certain fact
C．some facts	D．the way to solve it

Which of the following is NOT true?

A．Great scientists read a lot of books and asked many questions while reading.

B．Great scientists did thousands of experiments.

C．Great scientists always worked hard and never wasted time.

D．Great scientists got everything from school.

The passage is written mainly to tell us         .

A．how to memorize some facts or a formula（公式）

B．who the great scientists are

C．How to study

D．why Edison didn’t finish primary school