B.cleaners can't always differ exhibits from rubbish

　　C.exhibits are usually difficult to clean

　　D.exhibits are not always so beautiful

　　4.What's the best title of the passage?

　　A.Cleaners mistake modern art for rubbish

　　B.Modern art shouldn't be cleaned

　　C.What makes a great work of art

　　D.Cleaners don't always throw things away

　　1．解析：选C　细节理解题根据第二段中的“However, to make absolutely sure the same thing would not happen again, they decided to cover ... with a coloured cloth.”可知他们这样做的目的是避免清洁工再次犯同样的错误即C项正确解析：选B　细节理解题根据第一段的第一句可知A项表述正确；根据第二段的第二句可知B项表述错误；根据第三段的第二句和最后一句可知CD两项表述正确故选B项解析：选B　推理判断题最后一段通过讲述清洁工误把现代艺术作品当成脏东西而擦掉的事来说明清洁工并不总是能分清现代艺术作品与垃圾即B项正确解析：选A　标题归纳题文章开头的前两句话点明了主题然后全文都是围绕清洁工误把现代艺术作品当成垃圾展开叙述的即A项正确

　　Some years ago on a hot summer day in south Florida a little boy decided to go for a swim in the old swimming lake behind his house.

　　In a hurry to dive into the cool water，he ran out the back door，leaving behind his shoes，socks，and shirt as he went.He flew into the water，not realizing that as he swam toward the middle of the lake，an alligator (鳄鱼) was swimming toward the shore.

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