题目

An 80-year-old man was sitting on the sofa in his house along with his 45-year-old highly educated son. Suddenly a crow perched on the tree near their window. The father asked his son, “What is this?” The son replied, “It is a crow.” After a few minutes, the father asked his son the second time, “What is this?” The son said, “Father, I have just now told you. It is a crow! ” After a little while, the old father again asked his son the third time, “What is this?” “It’s a crow, a crow, a crow!” said the son loudly. A little after, the father again asked his son the f（1）今年“两会”期间，北京连续出现严重的雾霾天气，给人们出行带来了严重的影响．国家环境保护部门对外公布《环境空气质量标准》，将PM2.5作为评价项目纳入标准．PM2.5是指大气中直径小于或等于2.5微米的颗粒物．①雾霾天气导致呼吸道病人增多，因为这种天气，空气中______大量增加（填字母序号）；A．二氧化碳　　　　 B．一氧化碳　　　　 C．可吸入颗粒物　　　　 D．二氧化硫②防PM2.5专用口罩使用了活性炭的______作用；③请你提出一条防治空气污染的合理建议：______．（2）生活中处处蕴含着化学知识，请解释：①夏天的黄昏，鱼塘里的鱼儿总爱在水面游动，请从溶解度角度分析：______②校园有几棵玉兰花，开花时会散发出令人陶醉的芳香，请从分子的角度解释该现象：______．