Poetry with exothermic changes in material state

It is the most basic content in the senior high school entrance examination to investigate the absorption and heat release of six state changes through ancient poems. Among the six state changes of melting, solidification, vaporization, liquefaction, sublimation, melting, vaporization and sublimation are endothermic, while solidification, liquefaction and sublimation are exothermic. "The trees in the mountains are eclipsed, and the springs by the stream never trickle" are all caused by water evaporation. Water changes from liquid to steam, which is a vaporization phenomenon. A is correct. Fog and rain are small water droplets formed by water vapor in the air when it is cold. They are liquefaction and give off heat. B is wrong. Ice is solid ice which is changed from liquid water, and it is a solidification phenomenon. Snow changes from gaseous water vapor to solid state, which is a condensation phenomenon, exothermic and C- wrong. Frost is a small ice crystal formed by water vapor in the air when it is cold. This is a condensation phenomenon, exothermic and D- error. The answer is A. The practice of poems, famous sentences and idioms reflects the comprehensiveness of the subject. The premise of answering questions is to use Chinese knowledge to understand poems, famous sentences, idioms and proverbs. Then find out the physical phenomena they reflect, analyze them with corresponding physical knowledge, and finally get the answer. Non-multiple choice questions, the answers should be sorted out in physical language.