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【单选题】
已知a是单调函数f（x）的一个零点，且x 1 ＜a＜x 2 则（ ）A.
f（x 1 ）f（x 2 ）＞0
B.
f（x 1 ）f（x 2 ）＜0
C.
f（x 1 ）f（x 2 ）≥0
D.
f（x 1 ）f（x 2 ）≤0
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