[中考原题]阅读下面文章,回答文后问题。“沙漠明珠”珠光渐暗①和莫高窟并称为敦煌两大奇观的月牙泉有“沙漠明珠”之称,但由于干旱缺水和人为因素的影响,月牙泉水住在不断下降,这颗“明珠”珠光渐暗,甚至有消失的危险。②敦煌市鸣沙山月牙泉管理处提供的水文实测资料表明,1960年月牙泉水域面积为22.3亩,最大水深7.5米;1986年水域面积为13.3亩,最大水深4.2米;目前水域面积只有9亩,最大水深仅1米左右。 [The original exam] Read the following article, answer the text after the problem. “Pearl of the Desert” pearl dim ① and the Mogao Grottoes and known as the two wonders of Dunhuang Crescent Moon “Pearl of the Desert,” said, but due to the impact of drought and human factors, crescent spring water living in declining, this “Pearl” pearl dim, and even danger of disappearing. ② Dunhuang Mingsha Mountain Crescent Moon Spring Management Office provided hydrological data show that in 1960 the Crescent Moon waters area of ​​22.3 acres, the maximum depth of 7.5 meters; 1986 watershed area of ​​13.3 acres, the maximum depth of 4.2 meters; current water area of ​​only 9 Mu, the maximum depth of only about 1 meter.