大学英语口语选修选个主题说英语，主题如补充说明，请大侠你解说每个主题的思路。

As China's economic development into the fast lane, the demand for energy is increasingly urgent that China is a coal as the main source of energy, the coal mine to ensure social stability and rapid economic development in a very important role, it is necessary to ensure that coal the safe operation of mining, mine ventilation system is necessary to ensure the scientific, efficient, and achieve continuous ventilation, stability, high efficiency, so as to create a good environment and security hot-wet production environment. The curriculum design is to consider the long-term planning in Shandong coal production over the next decade, from 2009 to 2018 is divided into three periods: 2011, 2016, 2018, due to focus on coal production to the west the transfer of mining area, so the time to adjust production there will be an increase in mining area west of the coal face of the number of heading face the end of each period to make an evaluation of different options, arrive at different