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
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单项选择题
What is the main idea of the first paragraph
A．People do not always analyze the problem they meet.
B．People often accept the opinions or ideas of other people.
C．People may learn from their past experience.
D．People can not solve some problems they meet.
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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