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【单选题】
假设消费者的效用函数为u(x，y)=ln(x 0.5 +y)，消费者面临的商品空间由商品x和商品y构成。在二维的商品空间中，如果以y的数量为纵轴，以x的数量为横轴，那么消费者在此商品空间中的无差异曲线的斜率为______。A.
-1/(2x 0.5 )
B.
-(y+x 0.5 )/(2x)
C.
-1/(2x 0.5 +1)
D.
-(y+x 0.5 )/(2yx 0.5 )
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B.
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A.
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B.
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C.
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