因:rather than changes in the material properties of the string, 果:Guitar strings often go "dead",关键词go dead在e中出现
控制变量:Determining whether smearing various substances on new guitar strings causes them to go dead
选项B: Mideast immigrants are exhibiting rates of entrepreneurship exceeding virtually every other immigrant group in the increasingly diverse United States economy. 其中exceeding作为定语修饰rates of entrepreneurship
E:真正具有对比关系的,应该是small quantities of spices are used(这里的重心词是use这个事件)和take,而不是本选项中的 the usage of spices is in small quantities(这里的be动词这个状态)和take。但在逻辑上,真正能对比的对象应该是use和take。
d根本稳重没提到,无关选项。。一定要和文中主旨有关系,而不是单纯脑补正确的无关选项