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.

　　C．Condition makes no difference to scientists.

　　D．There’s no point for ordinary people knowing how to investigate.

　　解析：　细节理解题。由第二段“If the conditions are different，any changes the scientist observes in a demonstration (演示) must be explained by the changes in the conditions.”可知。

　　答案：　B

　　3．“The scientist，however，goes one step further，...”the author says this to show ________.

　　A．the importance of information

　　B．the importance of thinking

　　C．the difference between scientists and ordinary people

　　D．the difference between carpenters and people with other

　　jobs

　　解析：　句意理解题。上文提到了如何调查，如何发现信息对每个人来说都很重要，下文用however引起转折，说明科学家们应该更进一步，他必须确保问题有合理的答案。故此处的the scientist，however，goes one step further，...用来说明科学家和普通人的不同之处。

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