努力学习也是孝敬父母的表现。 [ ]
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已知动圆P与定圆C:(x+2)2+y2=1相外切,又与定直线L:x=1相切,求动圆的圆心P的轨迹方程.
Every man has his faults. We should, therefore, learn to be ______ of others.
A.ignorant
B.responsible
C.reliable
D.tolerant