求教两道阅读啊！真心不知道这两题是怎么回事~选项和原文对照看不懂啊~

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When we consider great painters of the past, the study of art and the study of illusion cannot always be separated. By illusion I mean those contrivances of color, line, shape, and so forth (and so forth: 等等) that lead us to see marks on a flat surface as depicting three-dimensional objects in space. I must emphasize that I am not making a plea, disguised or otherwise (or otherwise: 或相反), for the exercise of illusionist tricks in painting today, although I am, in fact, rather critical of certain theories of non-representational art. But to argue over (argue over: 辩论[争论]某事) these theories would be to miss the point. That the discoveries and effects of representation that were the pride of earlier artists have become trivial today I would not deny for a moment (for a moment: 一会儿, 片刻). Yet I believe that we are in real danger of losing contact with past masters if we accept the fashionable doctrine that such matters never had anything to do with art. The very reason why the representation of nature can now be considered something commonplace should be of the greatest interest to art historians. Never before has there been an age when the visual image was so cheap in every sense of the word. We are surrounded and assailed by posters and advertisements, comics (a: COMIC STRIP b: COMIC BOOK c plural: the part of a newspaper devoted to comic strips) and magazine illustrations. We see aspects of reality represented on television, postage stamps, and food packages. Painting is taught in school and practiced as a pastime, and many modest amateurs have mastered tricks that would have looked like sheer magic to the fourteenth-century painter Giotto (Giotto: 乔托(Giotto di Bondone, 1266?-1337, 意大利画家、雕刻家、建筑师)). Even the crude colored renderings on a cereal box might have made Giotto’s contemporaries gasp. Perhaps there are people who conclude from this that the cereal box is superior to a Giotto; I do not. But I think that the victory and vulgarization (vulgarize: to diffuse generally: POPULARIZE) of representational skills create a problem for both art historians and critics.
In this connection (in this connection: 关于这一点， 就此而论) it is instructive to remember the Greek saying that to marvel is the beginning of knowledge and if we cease to marvel we may be in danger of ceasing to know. I believe we must restore our sense of wonder at the capacity to conjure up by forms, lines, shades, or colors those mysterious phantoms of visual reality we call “pictures.” Even comics and advertisements, rightly viewed, provide food for thought (food for thought: 精神食粮). Just as the study of poetry remains incomplete without an awareness of the language of prose, so, I believe, the study of art will be increasingly supplemented by inquiry into the “linguistics” of the visual image. The way the language of art refers to the visible world is both so obvious and so mysterious that it is still largely unknown except to artists, who use it as we use all language—without needing to know its grammar and semantics.
20.
The author’s statement regarding how artists use the language of art (lines 48-52) implies that
(A) artists are better equipped than are art historians to provide detailed evaluations of other artists’ work
(B) many artists have an unusually quick, intuitive understanding of language
(C) artists can produce works of art even if they cannot analyze their methods of doing so
(D) artists of the past, such as Giotto, were better educated about artistic issues than were artists of the author’s time（A）
(E) most artists probably consider the processes involved in their work to be closely akin to those involved in writing poetry
21.
The passage asserts which of the following about commercial art?
(A) There are many examples of commercial art whose artistic merit is equal to that of great works of art of the past.
(B) Commercial art is heavily influenced by whatever doctrines are fashionable in the serious art world of the time.
(C) The line between commercial art and great art lies primarily in how an image is used, not in the motivation for its creation.
(D) The level of technical skill required to produce representational imagery in commercial art and in other kinds of art cannot be compared.（E）
(E) The pervasiveness of contemporary commercial art has led art historians to undervalue representational skills.