A:①②③
B:①②④
C:①③④
D:②③④
已知过定点P(﹣2,0)的直线l与曲线y= 2-x2相交于A,B两点,O为坐标原点,当△AOB的面积取到最大值时,直线l的倾斜角为____ .
—Yes, he was the first Chinese writer ________ won the prize for children's literature.
42170000000____41270000000