[解析]
(1)推理判断题。根据第二段Archaeologists have found six new sacrificial pits (祭祀坑)and unearthed more than 500 treasures dating back 3,000 years at the Sanxingdui Ruins in Sichuan Province.(考古学家在四川三星堆遗址发现了6个新的祭祀坑,出土了500多件距今3000年的珍宝。)可知,出土的宝藏可以追溯到3000年前。故选C。
(2)细节理解题。根据倒第二段Together they form an area in which people of the ancient Shu civilization held ceremonies to offer sacrifices to heaven,earth and their forefathers,and prayed for good luck and peace.(它们共同构成了古蜀文明的人们举行祭祀天地和祖先,祈求好运和和平的仪式的区域。)可知,祭祀坑的主要功能是举行祭祀仪式。故选D。
(3)细节理解题。根据最后一段The site was accidentally discovered by a farmer in the 1920s.(该遗址是在20世纪20年代被一位农民偶然发现的。)可知,一个农民最先发现了三星堆遗址。故选A。
(4)词义猜测题。根据最后一段The Sanxingdui Ruins is regarded as one of the greatest archaeological finds of mankind in the 20th century.The site was accidentally discovered by a farmer in the 1920s.(三星堆遗址被认为是20世纪人类最伟大的考古发现之一。该遗址是20世纪20年代一位农民偶然发现的。)最后一段中带下划线的单词的意思是"认为"。A.Searched.搜索;B.Considered.考虑,认为;C.Exploded.爆炸;D.Decorated装饰。故选B。