A:减轻旅游活动对文化遗产的破坏
B:控制工业污染对历史性建筑物、雕塑和壁画的侵蚀
C:在著名文化遗产周围禁止修建高大的现代建筑物
D:在故宫里面建大型商场以吸引游客
The difficulty which we had ______ with the local people has been removed.