单项选择题


A．dwelling
B．inhabited
C．lived
D．existing
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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.
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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