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下列反常积分收敛的是
A. $\int _{0}^{1} \dfrac {dx}{ \sqrt {x}(x-1)} $     B. $\int _{0}^{+ \infty } \dfrac { \sqrt {x}}{1+x \sqrt {x}}dx$     C. $\int _{1}^{+ \infty } \dfrac {dx}{ \sqrt {x^{2}-x}} $     D. $\int _{0}^{1} \dfrac {dx}{ \sqrt {x-x^{2}}}$         
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