In a rectangular coordinate system, the set of all points (x, y) such that x2+y2＜1 comprises

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问题 In a rectangular coordinate system, the set of all points (x, y) such that x²+y²＜1 comprises

选项 A、a triangular region
B、two parallel line segments
C、a circular region
D、a rectangle region
E、a square region

答案C

解析 x²+y²=1刚好是以圆点为圆心，半径为1的圆的方程，x²+y²＜1表示的是圆内所有点的集合，所以选择C。

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