单项选择题


A．hunger
B．flood
C．insect pest
D．natural disaster
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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 and error
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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