题目

化学与人类生产、生活密切相关，下列过程中不涉及化学变化的是（） A． 高粱酿酒 B． 铁矿炼铁 C． 干冰升华 D． 焚烧秸秆 答案：C【详解】 A、高粱酿酒过程中有新物质乙醇生成，属于化学变化。 B、铁矿炼铁过程中有铁等新物质生成，属于化学变化。 C、干冰升华过程中没有新物质生成，只是二氧化碳从固态变为气态，属于物理变化。 D、焚烧秸秆过程有二氧化碳等新物质生成，属于化学变化。 故选： C。Saturday, June 16thIn the morning, we went camping in Green Natural Park. We were happy because it was a sunny day. We were looking forward to a wonderful two-day holiday. On the way, we kept singing and making jokes.However, in the afternoon, when we finished our picnic at one o’clock, it was dark and windy. Soon, there was a shower(阵雨). Unluckily, none(没有人) of us brought an umbrella. We ran about but we could find no place to hide.Twenty minutes passed and it was still raining. There were hours to go before we reached the campsite (野营地). It was even worse that our small compass (指南针) showed that we went to the wrong way. We lost our way!We had to make a quick decision（决定）because it was raining heavily. Chris said we could put up a tent to hide in, so Mary and Tom helped to put up the tent. Chris and I tried to make a fire to keep us warm. But we weren’t able to light(点燃) the fire, because everything was wet. We dried ourselves, chatted and waited inside the tent. At about five o’clock, it stopped raining. We decided to give up (放弃)the camping trip because all of us were very tired.This camping trip may not be successful (成功的) but we know each other better. And the most important thing I’ve learned from this camping trip is team spirit(合作精神).Answer the following questions with No More Than 4 Words【小题1】Where did they go camping?_____________________________________________________________________________【小题2】 When did they finish their picnic?_____________________________________________________________________________【小题3】Why weren’t they able to light(点燃) the fire?_____________________________________________________________________________【小题4】How long did the rain last(持续)?_____________________________________________________________________________【小题5】What’s the most important thing that the writer has learned from the camping trip?_____________________________________________________________________________