若集合 $A=\left\{\overline{)x}\left|x\right|\le 1,x\in R\right\},B=\left\{\overline{)y}y=x^2,x\in R\right\}$,则 $A\cap B=$（）

A．	$\left\{\overline{)x}-1\le x\le 1\right\}$	B．	$\left\{\overline{)x}x\ge 0\right\}$
C．	$\left\{\overline{)x}0\le x\le 1\right\}$	D．	$\varnothing$