A. is non-existent B. is that the latter needs confirmation C. rests on the simplicity of the former D. is the difference between the modern scientists and the ancient Greeks 参考答案:B 答案解析:事实细节题。线索在原文的最后一段。最后一段区分了事实和理论的差异。真实的理论有事实的所有特性,然而验证理论的方法却是间接的、困难的。要把理论转化为事实需要增加简单的证实。因此 B是正确答案。