题目

属于化学变化的是（ ） A．晾干湿衣服 B．橙子榨汁 C．瓷碗破碎 D．纸张燃烧 答案：【考点】化学变化和物理变化的判别． 【分析】化学变化是指有新物质生成的变化，物理变化是指没有新物质生成的变化，化学变化和物理变化的本质区别是否有新物质生成；据此分析判断． 【解答】解：A、晾干湿衣服过程中只是状态发生改变，没有新物质生成，属于物理变化． B、橙子榨汁过程中 选词填空。 in order to,   face to face,   a series of,   set down,   on purpose,   suffer from 1. I worked hard at English _____ know more about the world. 2. I _____ the story as soon as you tell me.3. There has been _____ car accidents at the crossing.4. I'm sorry I have knocked off your book,but I didn't do it _____. 5. When I stood _____ with Yang Liwei,I couldn't help respecting this national hero. 6. You seem to _____ depression. What's the problem?