[填空题]The expression of "Yet houses are still being erected today at vulnerable sites around Vesuvius" is used to show ______.

[A] Yet thieves still reap a rich harvest. Inadequate protection of U. S. patents, trademarks and copyrights costs the U. S. economy $ 80 billion in sales lost to pirates and 250,000 jobs every year, according to Gary Hoffman, an intellectual property attorney at Dickstein, Shapiro & Morin in Washington. The computer industry loses upwards of $ 4 billion of revenues a year to illegal copying of software programs. Piracy of movies, books and recordings costs the entertainment business at least $ 4 billion annually.
[B] With intellectual property now accounting for more than 25% of U.S. exports (compared with just 12% eight years ago), protection against international piracy ranks high on the Bush Administration’s trade agenda. The U. S. International Trade Commission, the federal agency that deals with unfair-trade complaints by American companies, is handling a record number of cases (38 last year), Says ITC Chairman Anne Brunsdale: "Conceptual property has