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【单选题】
林老师给出一个函数，甲、乙、丙三位同学分别指出了这个函数的一个性质： 甲：函数的图象经过第二象限； 乙：函数的图象经过第四象限； 丙：在每一个象限内，y值随x值增大而增大． 根据他们的叙述，林老师给出的这个函数可能是（ ）A.
y=-3x
B.
y=- 3 x
C.
y=x-3
D.
y=x 2 -3
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