单项选择题

What is the best title for this passage

A．How to Recognize and Define Problems.
B．Six Stages for Repairing Bicycles.
C．Stages of problem Analysis.
D．Analyzing a Problem by Yoursel
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单项选择题
As used in the first paragraph, the phrase by trial and error means ______.
A．refer to others
B．by accident
C．consult teachers
D．through experiments
单项选择题
What is the author's purpose of referring to Sam's broken bicycle
A．To illustrate the ways to repair his bicycle.
B．To discuss the problems of his bicycle.
C．To tell us how to solve a problem.
D．To show us how to analyze a problem.
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