设地球绕太阳做匀速圆周运动的轨道半径为R，速率为v，引力常量为G，则太阳的质量为多少？太阳围绕银河系中心的运动可视为匀速圆周运动，其运动速率约为地球公转速率的7倍，轨道半径约为地球公转轨道半径的2×10⁹倍．为了粗略估算银河系中恒星的数目，可认为银河系中所有恒星的质量都集中在银河系中心，且银河系中恒星的平均质量约等于太阳质量，则银河系中恒星数目约为多少？

Which of the following is NOT a form of plagiarism（）

A. Citing quotations said to be attributable to "leading analysts" or "investment experts" without specific reference.

B. Presenting statistical forecasts by others with the sources identified but without the qualifying statements that may have been used by the originator.

C. Using factual information published by a recognized financial statistics reporting service without acknowledgment.