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【单选题】
下面说法不正确的选项（ ）A.
函数的单调区间可以是函数的定义域
B.
函数的多个单调增区间的并集也是其单调增区间
C.
具有奇偶性的函数的定义域定关于原点对称
D.
关于原点对称的图象一定是奇函数的图象
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