| 至顶版里面有写  http://forum.chasedream.com/dispbbs.asp?boardid=24&id=192169&star=1#1807226   76. A famous singer recently won a lawsuit against an advertising firm for using another singer in a commercial to evoke the famous singer's well-known rendition of a certain song. As a result of the lawsuit, advertising firms will stop using imitators in commercials. Therefore, advertising costs will rise, since famous singers' services cost more than those of their imitators.
     第一句是背景(了解大意即可)
 注意第2句中的as a result,在这里是sub-conclusion的指示词,那么它后面的sub-conclusion就是结论的条件
 Conclusion(指示词,therefore, since): 判定是因果型结论 famous singers cost more->ad cost rise 
    思路1:排除他因,没有别的因素影响advertising costs
 (注意关键字,ad costs, famous singers, more, imitators)
 思路2:无因无果,famous singers services不cost more,ad费用就不rise(不大好)
              有因有果  famous singers, ad 费用增加
 思路3:因果没颠倒(ad 费用高引起famous singers 高于后者,不好)
 所以思路1比较好,排除他因
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