单项选择题

By means of induction and deduction, ______.

A．scientists create theories based on Nature
B．ordinary people fulfill daily activities
C．ordinary people benefit from Nature
D．scientists develop skills in science work

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单项选择题

To acquire the method of scientific investigation, one ______.

A．needs do necessary exercises on his/her mind
B．has to reason things and get accurate explanations
C．has to analyze the reasons of all the phenomena
D．needs practice balance skills constantly

单项选择题

Inductive and deductive methods used in daily life and in science field are ______.

A．similar in quantity
B．opposite in nature
C．the same exactly
D．different in degree