According to a German professor, the soreness comes from straining your muscles in an uncommon way, for example, jumping on a bicycle for a ride, because you haven't ridden in a long time.
2019年12月四级真题（第一套）听力 Section C
But adding Venice to the UNESCO endangered list—which is dominated by sites in developing and conflict- ridden countries—would be an international embarrassment, and could even hurt Italy's profitable tourism industry.