已知集合 $A\left\{\overline{)x}x>0\right\},B=\left\{\overline{)x}-1\le x\le 2\right\}$则 $A\cup B$=（）

A．	$\left\{\overline{)x}x\ge -1\right\}$	B．	$\left\{\overline{)x}x\le 2\right\}$
C．	$\left\{\overline{)x}0<x\le 2\right\}$	D．	$\left\{\overline{)x}-1\le x\le 2\right\}$