51. Unlike most of the world"s volcanoes, they are not always found at the boundaries of the great drifting plates that make up the earth"s surface; on the contrary, many of them lie deep in the inter
1. The American economic system is, organized around a basically private-enterprise, market- oriented economy in which consumers largely determine what shall be produced by spending their money in the
1. The only way that they can preserve their history is to recount it as sagas--legends handed down from one generation of story-tellers to another.解读:legends作sagas的同位语,后接被动分词短语做定语。
