一个成年人参加一次长跑，身体消耗的能量约为8.4×106 J，这些能量相当于完全燃烧0.7kg的干木柴才能得到．将这些干木材放在煤炉中用来烧水，可以使8kg的水温度升高50℃，已知水的比热容为4.2×103 J/（kg．℃）．求：
Dan and Kim are friends. Dan lives in an apartment downtown(市中心). It is very convenient to go to work or go shopping, but it's too noisy. There is a lot of traffic. Sometimes Dan can't stand(忍受). Kim has a house in the suburbs(郊区). It's not convenient to go to work or go shopping, but it's very quiet. There is not much to do. In fact, nothing ever happens.
Dan and Kim have a good idea. They decide to trade(决定交换)places one week.
下列对诗歌《卖炭翁》理解有误的一项是（ ）
兰州新区正在飞速的发展，展望未来，我们信心百倍。请写出一句祝福兰州新区的话。
