[简答题]The saddest aspect of mass tourism has been brought recently to the attention of the public: it seems that the great number of visitors is destroying the treasures that they enjoy most. Under millions of feet, ancient stones wear out, ancient floors break down. Parts of the palace of Versailles may have to be closed to the public in order to preserve them, and some European caves, famous for their thirty-thousand-year-old paintings, have already been closed because the paintings were damaged by human respiration. There may come a time when only specialists in art, history, or archaeology will be allowed near the treasures of the past. Perhaps we’d better hurry to see them; perhaps we’d better take a tour soon.

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