托福综合写作Word文档下载推荐.docx

1、托福综合写作#托福综合写作#CASE STUDY 1#【Reading:#】#You will have 3 minutes to read the passages.#As fossil fuels begin to dwindle, a higher and higher emphasis has been placed on technologies to use these fuels more efficiently. One family of such technologies is called “clean coals”, so called because it uses

2、coal in less-polluting ways. There are at least three distinct advantages that this family displays.#The first of these results from the new coal burning technology and ensures a higher combustion ratio and temperature. That is, more of the burnable part of the coal is actually burned. The great ben

3、efit here is that less coal is needed to obtain bn a given amount of heat than with other, more primitive, methods. A corollary benefit is that far less burnt coal particle-matter is released into the air as smoke.#Second, a technique known as “coal washing” can, in effect, purify coal before burnin

4、g. The result is that burning such coal releases only a very small amount of sulfur dioxide into the atmosphere. This is a key advantage, given that sulfur dioxide pollution is leading cause of acid rain. And acid rain, in turn, is a serious pollutant of water and an impediment to reforestation.#Fin

5、ally, a technique known as “carbon capture” helps drastically reduce carbon dioxide emissions. This is perhaps the biggest consideration of all, since carbon dioxide has been identified as the leading culprit in causing the “greenhouse effect” and resulting in global warming.#Taken together, clean c

6、oal technologies go far to ensure that such coal reserves as remain on Earth will be used in the most efficient and non-polluting manner.#【lecture】#Now listen to part of a lecture on the topic you just read about.#【Essay Topic】#Summarize the points made in the lecture you just heard, explaining how they cast doubt on points made in the reading.#You must finish your answer in 20 minutes.#CASE STUDY 2#CASE STUDY 3#CASE STUDY 4#