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【简答题】
已知椭圆E的焦点坐标为F 1 （-2，0），点M（-2， 2 ）在椭圆E上． （1）求椭圆E的方程； （2）设Q（1，0），过Q点引直线l与椭圆E交于A，B两点，求线段AB中点P的轨迹方程； （3）O为坐标原点，⊙O的任意一条切线与椭圆E有两个交点C，D且 OC ⊥ OD ，求⊙O的半径．
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