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 of atmosphere, no negative effect when releasing so2 at higher level of atmosphere 2.compare to other solusions, inexpansive. example: reducing fuel burning emission, need great scientific break through which is 100 times cost of releasing SO2 3.little temperature reduction have far-reaching p... [ 查看全文 ]托福写作:2012.7.22大陆托福写作考试机经回顾2的相关文章