阅读理解

    The summer vacation is over．Time always flies fast．During the vacation, the weather was hot and I couldn't do much work, but I lived happily．

    Because it was hotter in the afternoon, I did my homework in the morning．I got up at 6：30 am and took a walk in the garden for half an hour．

    After breakfast, I read English and Chinese and did some maths exercises．It took me three hours or more to finish my homework．I worked quite hard and made good progress．

    I spent the afternoon outside．I went to swim and it was fun．I came home at about five or six o'clock．Sometimes a friend of mine would come to see me, and we would spend some time listening to music．

    In this way I spent my vacation happily．I not only studied but also became a good swimmer．Now I'm in good health and in high spirits．

下列变化过程中，属于化学变化的是（　　）

人类生活、生产、学习、研究都离不开能源的消耗，由于人口的急剧增加和经济的不断发展，能源的消耗持续增长．下列能源中既属于一次能源又属于可再生能源的是（　　）