【正确答案】 B

【答案解析】细节题。见第二段"Some people think that man might be able to solve both problems at the same time．They suggest using garbage as an energy source，and at the time it can save the land to hold garbage．”有人认为我们可以同时把两个问题解决：一是解决了能源紧缺的问题；二是节省了填埋垃圾的土地。