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

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单项选择题

21（）

A．young
B．old
C．sad
D．happy

单项选择题

Alaska belonged to（）before 1867.

A．Russia
B．America
C．Canada
D．Japan