意大利著名“贫穷艺术”大师库奈里斯的作品用蛮荒久远的原始材料幻化出生动的视觉形象。他在中国创作的作品又加进了更多中国元素，如旧瓷碗、泥土、废旧钢筋等，不仅重新组合了它们之间的关系，而且更表现出了他对东西方文化深层次的思考。这说明（    ）

①艺术家对材料的认识具有自觉选择性

②巧妙的构思可以将任何材料转化为作品的一部分

③艺术创作需要合理构建材料之间具体的客观联系

④艺术家的创意实现了材料存在形式的改变

   Here are some facts about homes in the United States and the people who live in them. In the early 1990s, about 50% of the Americans own their homes and the rest rent(租) their homes. The rented homes are usually apartments(公寓).
   74% of the people in the US make their homes in or around cities. 26% live in the country. Dogs live in about 40% of all homes in the US. About half that number have cats.
   Families in the US are becoming smaller. On the average（平均）,2.64 people lived in a home in the early 1990s. In 1960, the average was 3.5.
   Half of the teenagers in the US have their own bedrooms.
   An American moves, on the average，twelve times in his or her life. In Japan, a person moves about five times, and in England a person moves eight times.