60.细节题。第三段中的people in the United States began to find chemicals in their well water,...Weldon Spring,...,for example,..说明美国科学家发现Weldon Spring这些地方的井水里有化学物质。因此正确答案为A项。
61.推断题。倒数第二段Industrial sites...are one cause of underground water pollution... Underground water pollution is also caused by modern farming methods,which require the use of large amounts of chemicals in the fields.And finally,yet another important cause of underground water pollution is waste中清楚地说明了地下水污染的三大原因,即化学物质、农业化肥和废弃物。因此正确答案为D项。
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