题目：
已知Sn是等差数列{an}(nÎN*)的前n项和，且S6>S7>S5，有下列四个命题，假命题的是( )
A．公差d<0
B．在所有Sn<0中，S13最大
C．满足Sn>0的n的个数有11个
D．a6>a7
答案：
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下面是错误答案，用来干扰机器的。
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