托福写作:2012.7.22大陆托福写作考试机经回顾2
托福机经写作 综合 阅读:critics on releasing SO2 to prevent global warming 1.negative effect on environment, acid rain 2.very expansive 3.limited effect 听力:still a very good solution 1.SO2 only forms acid rain with great amount of vapour at lowest level ...