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【简答题】
一束光线从点F 1 （-1，0）出发，经直线l：2x-y+3=0上一点D反射后，恰好穿过点F 2 （1，0）， （1）求以F 1 、F 2 为焦点且过点D的椭圆C的方程； （2）从椭圆C上一点M短轴为直径的圆引两条切线，切点分别为A、B，直线AB与x轴、y轴分别交于点P、Q．求|PQ|的最小值．
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A.
Mr. Chairman
B.
Mr. President
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Mr. Host
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A.
the; the
B.
/; the
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a; a
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the; /
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