(20 13? A model of Tongan District) Fujian Meteorological Observatory publishes the weather forecast of the whole province every day, as shown in the figure, which lists the temperature situation of t

(20 13? A model of Tongan District) Fujian Meteorological Observatory publishes the weather forecast of the whole province every day, as shown in the figure, which lists the temperature situation of the two cities from 2065438 to April 22, 2003. A: A city is Nanping and B city is Xiamen. There are many sandstone in Nanping area, and the specific heat capacity of sandstone is small. Under the same conditions, the temperature of sand and gravel changes greatly, and the daily temperature difference in Nanping City changes greatly. In Xiamen, at the seaside, the specific heat capacity of water is relatively large. Under the same conditions, absorbing (or releasing) the same heat, the temperature of water changes little, so the daily temperature difference changes little.