已知I1=∫01xdxI_1=\int_{0}^{1}x dxI1=∫01xdx,I2=∫01x3dxI_2=\int_{0}^{1}x^3 dxI2=∫01x3dx,则( ).
(A)I1>I2I_1 > I_2I1>I2
(B)I1<I2I_1 < I_2I1<I2
(C)I1=I2I_1 = I_2I1=I2
(D)I1I_1I1与I2I_2I2的大小关系无法判断
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