45．C　主旨大意题。文章论述的是为了提高开放网络教学的可信度所使用的高科技监考手段，由此可知C项最能概括全文。

　　C5 [2016·江苏卷]

　　D

　　Mark Twain has been called the inventor of the American novel.And he surely deserves additional praise：the man who popularized the clever literary attack on racism.

　　I say clever because anti－slavery fiction had been the important part of the literature in the years before the Civil War.H.B.Stowe's Uncle Tom's Cabin is only the most famous example.These early stories dealt directly with slavery.With minor exceptions, Twain planted his attacks on slavery and prejudice into tales that were on the surface about something else entirely.He drew his readers into the argument by drawing them into the story.

　　Again and again，in the postwar years，Twain seemed forced to deal with the challenge of race.Consider the most controversial, at least today, of Twain's novels, Adventures of Huckleberry Finn.Only a few books have been kicked off the shelves as often as Huckleberry Finn，Twain's most widely read tale.Once upon a time, people hated the book because it struck them as rude. Twain himself wrote that those who banned the book considered the novel “trash and suitable only for the slums(贫民窟)．”More recently the book has been attacked because of the character Jim，the escaped slave，and many occurences of the word nigger.(The term Nigger Jim，for which the novel is often severely criticized，never appears in it.)

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