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阅读短文 根据短文内容回答问题llampbrella  You can’t always predict a heavy rain or remember your umbrella. But designer Mikhail Belvacv doesn’t think that forgetting to check the weather report before heading out should result in you getting wet. To protect people from the rain, he created lampbrella, a lamp post with its own rain sensing umbrella. The designer says he comes up with the idea after watching people get wet on streets in Russia. “Once, I was driving on a central Saint Petersburg street and saw the street lamps lighting up people trying to hide from t煤是一种常用的化石燃料．家庭用煤通过了从煤球到蜂窝煤的变化（如图）．请分析这种变化的优点是： ．生活经验告诉我们，在更换蜂窝煤或太靠近煤炉时，会被“煤气”刺激得很难受，请从煤的组成成分的角度分析，解释这种现象的产生．解释： （用化学方程式作答即可）．