雅思听力替换原则之变通也是成功的要素

　　1.同意词替换如scientist 和researcher 之间的替换，disadvantage和downside，drawback之间的替换，sign替换indication。

　　2.同义词组的替换如：miss particularly替换 main attraction。

　　3.主动与被动的替换：Coffee farming provides work for 30 million people 替换 30 million people earn a living by growing coffee.

　　4.加减关系的替换：某题原文为Er, the bottles made in most places contain about three-quarters new glass and the rest is recycled.

　　该题题干为 Most bottle makers use about __% recycled glass.用总数1减去3/4得1/4，再转换成百分数即得答案，正确答案为25%