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 van Gogh or another painter covered the first painting with the portrait now seen on the surface of the canvas. Because the face of the woman in underimage also appears on canvases van Gogh is known to have painted, the surface painting must be an authentic self-portrait by Van Gogh. The conclusion above is probably drawn by 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 be reliably attributed to van Gogh contain underimages of subjects that appear on at least one other canvas that 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 painted canvas cannot be reliably 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. 这道题为什么选c啊，请说一下解题思路以及别的选项为什不选，谢谢了。
选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. 被错误认定为是凡高作品的画作不会也含有真正的凡高作品里的那些underimage(查词典没查到什么意思，感觉是背景的意思？）
D最好是用排除法. 你要注意到这部分"authenticity of any underimage that painting might contain can be reliably attibuted to the artist". 文章并没有提到authenticitiy of underimage can be reliably attributed to VG. 这里存在一个gap! 正确答案中也只是说appear.
窃以为D选项的问题出在充分必要条件的顺序之上
D选项讲的是 a painted canvas can be reliably attributed to an artist ----> the authenticity of any underimage that painting might contain can be reliably attributed to the artist 也就是从判定一幅画来自于一位画家，我们可以推出这幅画的底影来自于这位画家
而正确的思路应该是反过来，我们可以通过确认这幅画的底影来自于这个画家来判断这幅画来自于这个画家
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发表于 2010-5-21 21:55:45
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