What makes a person a scientist? Does he have ways or tools of learning that are different

What makes a person a scientist? Does he have ways or tools of learning that are different from those of others? The answer is “no”. It isn’t the tools a scientist uses but how he uses these tools which make him a scientist. You will probably agree that knowing how to use a power is important to a carpenter. You will probably agree, too, that knowing how to investigation, how to discover information, is important to everyone. The scientist, however, goes one step further; he must be sure that he has a reasonable answer to his questions and that his answer he gets to many questions is into a large set of ideas about how the world works.
The scientist’s knowledge must be exact. There’s 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 at one time must work under the same conditions at other times. If the conditions are different, any changes the scientist observes in a demonstration(实证) must be explained by the changes in the conditions. This is one reason why investigations are important in science. Albert Einstein, who developed the Theory of Relativity, arrived at the theory through mathematics. The accuracy(正确性) of his mathematics was later tested through investigation. Einstein’s ideas were proved to be correct. A scientist uses many tools for measurements. Then the measurements are used to make mathematical calculations(计算) that may test his investigations
【小题1】 What makes a scientist according to the passage?A．The tools he uses.B．His ways of learningC．The way he uses his toolsD．The various tools he uses【小题2】 “…knowing how to investigation, how to discover information, is important to everyone.”
The writer says this to show     .A．the importance of informationB．the difference between scientists and ordinary people.C．the importance of thinkingD．the difference between carpenters and ordinary people【小题3】 A sound scientific theory should be one that     .A．works under one set of conditions at one time and also works under the same conditions at other timesB．doesn’t allow any change even under different conditionsC．Can be used many times under different conditionsD．Can be used for many purposes【小题4】What is the main idea of the passage?A．Scientists are different from ordinary people.B．The Theory of Relativity.C．Exactness is the core (核心) of science.D．Exactness and way of using tools are the keys to making of a scientist.CCAD