A:20°
B:25°
C:30°
D:45°
A. It's time for Chinese class. B. It's time for lunch.
C. It's time for school. D. Time to go home.
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设曲线C的参数方程为x=-1+22cosθy=-2+22sinθ(θ为参数),直线l的方程为x+y+1=0,则曲线C上到直线l距离为2的点的个数为( )