题目

阅读短文, 根据短文内容回答问题。  Have you ever had problems in your life and don’t know how to be happy? If so, you will find Being A Happy Teenager by Australian writer Andrew Matthews is useful. Andrew Matthews is a writer, cartoonist and speaker. His books have been translated into 20 languages. He has been on over 2000 radios and TV programs. In his book, Matthews tells us how to have a happy life and answers the questions of teenagers. There are many topics such as parents and friends, and the book says we should stop being angry and forgive. The book tells us 碳酸铵((NH4)2CO3)在室温下就能自发地分解产生氨气，对其说法中正确的是（    ）   A.其分解是因为生成了易挥发的气体，使体系的熵增大   B.其分解是因为外界给予了能量   C.其分解是吸热反应，据能量判据不能自发分解     D.碳酸盐都不稳定，都能自发分解