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【单选题】
函数 ( ) A、 在区间(-∞,+∞)内是增函数 B、 在区间(-∞,+∞)内是减函数 C、 在区间(0,+∞)内是增函数 D、 在区间(-∞,0)内是减函数A.
在区间（-∞，+∞)内是增函数
B.
在区间（-∞，+∞)内是减函数
C.
在区间（0，+∞)内是增函数
D.
在区间（-∞，0)内是减函数
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