题目

Dream culture is an important part of ancient Chinese culture. Dream interpreting（理解）is popular in China, and the most famous reference for dream interpreting is the book of Duke of Zhou Interprets Dreams.        Ancient Chinese people thought that dreams could suggest lucky and unlucky things. Since different dreams have different meanings, people can  get meanings of good or bad luck by interpreting them. Actually, dream interpreting is not totally a superstition. It does have some scientific value. ● Dreams are the reflection of the facts. Many dreams are actually so下列变化中,前者是物理变化,后者是化学变化的是A．冰雪融化 食物腐烂 B．汽油挥发 工业上制取氧气C．酒精燃烧 铁生锈 D．水的电解 干冰升华