Some wonderfully creative uses of X-rays have been in the world of artBut the most impres

Some wonderfully creative uses of X-rays have been in the world of art．But the most impressive one is to uncover what has been covered up．Details unfolded by an X-ray of a painting can ' t be seen any other way．For example, in the past, paintings were often repaired if small pieces of paint fell off the canvas （帆布）． These repairs cannot be seen just by looking at the painting．It takes an X-ray to discover where the repairs have been made．
An X-ray of a painting is one of the best ways to tell if it was created by a famous painter or if it is a forgery（赝品）．If there is a question as to whether an old master has painted a certain painting or not, X-rays are made and compared to those of paintings that are known to be original．If the brushstrokes （笔迹） , for example, are shown to be totally different than in other work done by a certain artist, then the painting is proved to be a fake copy．
Since modern paints are usually made from different materials than paints of hundreds of years ago, the image they leave on an X-ray film looks different．This is another way X-rays can be used to spot a forgery．A modem artist will try to make a forgery look hundreds of years old by painting dirty varnish on it or by using artificial means to get the varnish to look cracked．To the naked eye the forgery may look old, but when a careful study of the X-ray image is made, the deception is obvious．
It was common many years ago for an artist to finish a painting, decide it wasn't any good, and paint a completely different picture on top of it．Or artists would paint over others' work —it was their version of recycling．Taking an X-ray is the only way to find out if there is a picture underneath the picture you see with your eyes．Sometimes museums will be more interested in the painting beneath than the one on top, and will restore the older one by having the top layer painstakingly removed．
【小题1】What is the main purpose of the article?A．To provide information to police who are looking for stolen art．B．To persuade art dealers to check for fake copies before selling art．C．To explain how modern technology can be applied in unique ways．D．To help artists restore damaged artwork to its original appearance．【小题2】According to the passage，X-rays are used to ．A．make repairs on paintings in the pastB．identify the authenticity of an artworkC．change the materials of a forgeryD．remove the recyclable paints【小题3】In Paragraph 3, the word deception probably means ．A．comparisonB．drawbackC．trickeryD．judgement【小题4】Which is the best title for the passage?A．X-ray DetectivesB．Creative Uses of TechnologyC．Forgery StudiesD．X-ray Painting TechniquesC

(答案→)C 解析：本文通过文章通过介绍X-ray在油画辨别侦察方面的作用，说明现代科技X-ray是如何以独特的方式应用于生活。【小题1】纵观全文，文章通过介绍X-ray在油画辨别方面的作用，就是解释说明现代科技是如何以独特的方式应用于生活。AD答案都只是X-ray在油画方面的一个作用，无概括性，B没提及。【小题2】从第二段An X-ray of a painting is one of the best ways to tell if it was created by a famous painter or if it is a forgery可知 X-ray被用来艺术作品的真假。故选B，A答案in the past 与原文不符。【小题3】根据本句句意，裸眼看一个赝品，看似旧的，但只要仔细研究制作的X-ray影像，其中的端倪就显而易见。故选trickery花招 。【小题4】主旨大意题。文章通过介绍X-ray在油画辨别方面的侦探作用，故A符合。BC答案扩大化，D答案中心词Techniques表达错误。

我也是这个答案