CXD P46-Q26

flyno1

这是陈向东逻辑推理里的一道assumption的题目，我觉得这到题目分析起来思路很混乱，如果在考试时我肯定更加理不清思路了，所以请大家来分析指点一下。

p46/Q26 X-ray examination of a recently discovered painting-judged by some authorities to be a self-portrait by Vincent van Gogh-revealed an underimage of a woman's face. Either theportrait now seen on the surface of the canvas. Because vases van Gogh is known to have painted, the surface paintingmust be an authentic self0protrait by an Gogh.

The coclusion above is properly drawn if which of the following is assumed?

(a) If a canvas already bears a painted image produced by an artist , a second artist who uses the canvas to produce a new painting tends to be influenced by the style of the first artist.

(b)Many painted canvases that can be reliably attributed to van Gogh contain underimages of subjects that appear on at least one other canvas that van Gogh is known to have painted.

(c)Any painted canvas incorrectly attributed to van Gogh would not contain an underimage of a subject that appears in authentic paintings by that artist.

(d)A paintedcanvas cannot be reliavly attributed to an artist unless the authenticity of any underimage that painting might contain can be reliably attributed to the artist.

(e)A painted canvas cannot be reliably attributed to a particular artist unless a reliable X-ray examination of the painting is performed.

我的逻辑分析是这样的：Ｘ－ＲＡＹ测出van Gogh 自画像下面有一个妇女的面部像的底影，那么要从有妇女面部像的画，推出表面的画一定是van Gogh的自画像，那么我在Ｂ和Ｃ这两个答案里选择了Ｂ，但是我觉得两个都可以作为假设？

但我问题的关键不在于答案，而是想知道大家的分析过程．

谢谢！