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计算题
1. What percentage of area is shaded?

Answer: _                                                          .
2. If a group of 6 people have an average age of 21,  and each person is half the age of the next person,
    what are the ages of the 6 people?
Answer: _                                                           .
1. “略”
2. 2,4,8,16,32and64
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【小题2】Why did the two men never talk about climbing when they first met?
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