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某地区2007-2015年的GDP总量变化情况如下表所示：
年份
2007
2008
2009
2010
2011
2012
GDP（万元）
3688
3940
4261
4730
5630
6822
在此期间该地区GDP的平均增长速度为（   ）。
A、12%
B、13%
C、36%
D、40%

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