The scientist’s knowledge must be exact.There is no room for half right or right just half the time.He must be as nearly right as the conditions permit.What works under one set of conditions sometimes must work under the same conditions at other times.If the conditions are different，any changes the scientist observes in a demonstration (演示) must be explained by the changes in the conditions.This is one reason that investigations are important in science.Albert Einstein，who developed the theory of relativity，arrived at this theory through mathematics.The accuracy of his mathematics was later tested through investigations.Einstein’s ideas were shown to be correct.A scientist uses many tools for measurements.Then the measurements are used to make mathematical calculations that may test his investigations.

　　1．What makes a scientist according to the passage?

　　A．The tools he uses.B．His ways of learning.

　　C．The ways he uses his tools.D．The different tools.

　　解析：　细节理解题。由第一段“It is not what the tools that a scientist uses but how he uses these tools that makes him a scientist.”可知。

　　答案：　C

　　．What can we learn from the passage?

　　A．The scientist’s knowledge is always right under all conditions.

　　B．When the condition changes，the result of the observation may also change.

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