已知角的顶点与原点重合,始边与x轴的正半轴重合,终边在直线y =2 x上,则  (   )                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  

A.                B.               C.               D.

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