(2014 Tancheng County Simulation) The Shandong Meteorological Observatory releases weather forecasts for major cities in our province every day. The picture lists the inland cities on April 12, 2014.

There is more water in coastal areas, and the specific heat capacity of water is larger. During the day, the same mass of water absorbs the same heat as sand and gravel, but the temperature of the water rises less;

At night , releasing the same heat, the temperature of the water drops less, making the temperature difference between day and night in coastal areas small. It can be seen from the table that the temperature difference in city B is small, so B is the coastal city Qingdao and A is Linyi.

So choose D.