1.设集合A={−1A=\{-1A={−1,0,1,2}2\}2},B={x∣x2−x⩽0}B=\{x\vert x^{2}-x\leqslant 0\}B={x∣x2−x⩽0},则A⋂BA\bigcap BA⋂B的子集个数为((( )))