已知角的頂點與原點重合,始邊與x軸的正半軸重合,終邊在直線y =2 x上,則  (  。                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  

A.                B.               C.               D.

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