单项选择题

设f(x)在[0，1]上连续，又
则
(A) F(x+π)＞F(Ⅳ)(x∈(-∞，+∞))．
(B) F(x+π)＜F(x)(x∈(-∞，+∞))．
(C) F(x+π)=F(x)(x∈(-∞，+∞))．
(D) x＞0时F(x+π)＞F(x)，x＜0 时F(x+π)＜F(x)．

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