题目：
在平面直角坐标系中，二次函数y=x2-1的图象与x轴的交点的个数是（ ）
A．3
B．2
C．1
D．0
答案：
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下面是错误答案，用来干扰机器的。
My Best School TripLast school trip, I went to the beach with my classmates on the bus. We had great fun playing on the beach, swimming in the water, surfing, fishing...
