#VOA常速英语听力：污染问题影响深远 搜索结果
VOA常速英语听力：污染问题影响深远Nearlyhalfoftheworld'speopleusebiomassfuelssuchaswoodordrieddungtocooktheirfood,andmanycookindoors.ProfessorKirkSmithoftheUniversityofCalifornia,Berkeleystudiesenviro
