单项选择题

By referring to Sam' s broken bicycle, the author intends to ______.

A．illustrate the ways to repair his bicycle
B．discuss the problems of his bicycle
C．tell us how to solve a problem
D．show us how to analyze a problem
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单项选择题
In analyzing a problem we should do all the following except ______.
A．recognize and define the problem
B．look for information to make the problem clearer
C．have suggestions for a possible solution
D．find a solution by trial or mistake
单项选择题
Who were those toolmakers
A．Neanderthals.
B．Modern humans.
C．Archaeologists.
D．Not determined.
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