单项选择题

A．Reading.
B．Writing.
C．Speaking.
D．Listening.
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单项选择题
A．Six Stages for Repairing Sam’s Bicycle.B．Possible Ways to Problem-solving.C．Necessities of Problem Analysis.D．Suggestions for Analyzing a Problem.
A．Six Stages for Repairing Sam’s Bicycle.
B．Possible Ways to Problem-solving.
C．Necessities of Problem Analysis.
D．Suggestions for Analyzing a Problem.
填空题
To avoid violation of other inventor’s right, experts advise to plagiarize a dead patent instead of ______.
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