用下列物质做燃料时,对环境污染最严重的是 请选择DCBA:D+y(q-s,M8r9N;I2o-D*q9e9g8o4Y'V,X.n
A.原煤9N;I2o-D*q9e9g8o4Y'V,X.n
B.天然气9N;I2o-D*q9e9g8o4Y'V,X.n
C.氢气9N;I2o-D*q9e9g8o4Y'V,X.n
D.酒精9N;I2o-D*q9e9g8o4Y'V,X.n