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【简答题】
已知F 1 （-1，0），F 2 （1，0）是椭圆 x 2 a 2 + y 2 b 2 =1的两个焦点，点G与F 2 关于直线l：x-2y+4=0对称，且GF 1 与l的交点P在椭圆上． （I）求椭圆方程； （II）若P、M（x 1 ，y 1 ），N（x 2 ，y 2 ）是椭圆上的不同三点，直线PM、PN的倾斜角互补，问直线MN的斜率是否是定值？如果是，求出该定值，如果不是，说明理由．
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A.
Genuine writers often find their work interesting and rewarding.
B.
A writer's success depends on luck rather than on effort.
C.
Famous writers usually live in poverty and isolation.
D.
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largest
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second largest
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third largest
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fourth largest
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