（科学家）
What makes a person a scientist? Does he have ways or tools of learning thatare different from those of others?The answer is“no”.It is not the tools ascientist uses but how
he uses these tools that make him a scientist.You will probably agree thatknowing how to use a power is important to a carpenter.You will probablyagree,too,that knowing
how to investigate,how to discover information,is important to everyone.Thescientist,however,goes one step further,he must be sure that he has areasonable answer to his
questions and that his answer can be confirmed by other persons.He also worksto fit the answer he gets to many questions into a large set of ideas about howthe world
works.
是什么使一个普通人成为科学家？他有与从不同的学习方法和工具吗？答案是否定的。不是因为科学家使用的工具，而是因为他使用工具的方法使他成为科学
家。你也许认同怎么用力对一名木匠来说很重要。你也许也认同怎么研究调查，发现信息对每个人来说都很重要。然而，科学家比这更进一步，他必须确定他
对自己的问题得出了一个合理的答案，并且他的答案通过别人也可以得到证实。他同时把自己得出的许多答案归结为一个系统的关于世界如何运作的观点。
The scientist’s knowledge must be exact.There is no room for half right orright just half the time.He must be as nearly right as the conditionspermit.What works under one
set of conditions at one time must work under the same conditions at othertimes.If the conditions are different,any changes the scientist observes in ademonstration must be
explained by the changes in the conditions.This is one reason thatinvestigations are important in science.Albert Einstein,who developed thetheory of relativity,arrived at this
theory through mathematics.The accuracy of this mathematics was later testedthrough investigations,Einstein’s ideas were shown to be correct.A scientistuses many tools
for measurements.Then the measurements are used to make mathematicalcalculations that may test his investigations.
科学家的知识必须很确切。不能给半错半对或者只有一半机会对的情况留任何空间。他必须在条件允许的情况下尽可能正确。在一种条件下成功一次的话必须
在同样的条件下都能成功。如果条件不同，科学家在证明过程中观察到的任何变化都必须解释他的条件是如何变化的。这是关于调查研究在科学研究中十分重
要的其中一个理由。爱因斯坦通过数学方法提出了相对论。他的数学运用的正确性被后人通过调查研究的方法证实该理论是正确的。一个科学家会用很多工具
来测量。测量的结果用来进行数学计算，再进行调查研究的测试。

What is the main idea of the passage?这篇文章的中心意思是什么？

A.The theory of relativity.

B.Exactness is the core of science.

C.Scientists are different from ordinary people.

D.Exactness and ways of using tools are the答案s to themaking of a scientist.确切性和使用工具的方法是成为科学家的重要因素。