单项选择题

What' s the weather like in the Arctic region of European Russia more than 30,000 years ago

A．Moderate temperature, relatively dry and ice -free.
B．Extremely cold, relatively dry and ice- free.
C．Extremely cold, plenty of raining and ice- free.
D．Extremely cold, relatively dry and ice frosted.
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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
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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