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A、bB、aC、aD、C【正确答案】:C
【题目解析】:【答案解析】log0.5x是减函数,6.7>1,所以log0.56.70.51=0,即a<0,log2x是增函数,5.6>4.3>1,所以log25.6>log24.3>log21=0,所以c>b>0,所以c>b>a.
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