【正确答案】Example 1: The first is to waste nature resources and second is to destroy the beauty of the nature world. The professor cites an example about her experiences to demonstrate this. One day, she received a booklet advertisement from the kitchen ware company. But it was useless for her because she didn't need such things for her apartment at all.And the people living around didn't need this either. So it's a waste of naturere sources, especially trees. Example 2: Also,the outside ads totally destroyed the nature beauty. No matter how beautiful the scenery is, it's ugly to put up a big advertisement board.