阅读理解精练一则(英文)

There are different ways in which peo-ple try to deal w ith the problem of energy.O ne w ay is the greater production of com -m on energy sources(能源),such as coal,oiland gas. The trouble w ith these sources,how ever,is that they are not renewable.A nother way is energy conservation (节能), which m eans using energy m ore effi-ciently (有效地). In som e very cold coun-tries people build special houses to saveenergy. They place m aterials betw een theinside and the outside of the walls of the…