A、It determines whether it is cold or not. B、It determines whether it is poor or not. C、It determines whether it has central hea

　　In the 1950s, the government drew a line along the Qinling Mountains and the Huaihe River, (5) which not only defines China’s northern and southern regions, but also determines whether you live in a region cold enough to receive government-supported heating. Cities north of the line have coal-fired central heating, while cities south of the line do not have this service.
　　In recent years, there have been growing calls to provide central heating to the south, as more and more people expect a better quality of life. But opinions are divided on the matter. Zhang Xiaomei, a member of the Chinese People’s Political Consultative Conference, supports reform. Pushing the line southward will keep more people warm and is "a solution for energy conservation
　　and emission reduction," says Zhang. (6) But industry experts have yet to reach a consensus on this claim, as coal-fired central heating often leads to smoggy weather.
　　Another problem concerns China’s energy security. Qiu Baoxing, former vice-minister of Housing and Urban-Rural Development, (7) worried that providing a central heating service in the south may undermine China’s energy supply.
　　5. What’s the function of the line along the Qinling Mountains and the Huaihe River?
　　6. Why do industry experts disagree with pushing the line southward?
　　7. What is another concern of providing a central heating service in the south?