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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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 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.