题目

下列化学反应中吸收热量的是（   ） A  镁与盐酸反应    B  C与氧气充分反应      C  C与氧气（不充分）反应     D  碳与二氧化碳的反应 答案：D －Now that you were willing to take a risk, why not set out right now? －I ________ that it is so adventurous． [　　] A．don't realize B．didn't realize C．wasn't realizing D．am not realizing