定位：Among the myths taken as fact by the environmental managers of most corporations is the belief that environmental regulations affect all competitors in a given industry uniformly. 话锋一转说In reality。。引出文章中心论点：regulatory costs — and therefore compliance — fall unevenly, economically disadvantaging some companies and benefiting others.
定位：
Resin is often confused with gum, a substance produced in plants in response to bacterial infections；与gum相关，排除B
Resin differs from both gum and sap in that scientists have not determined a physiological function for resin；C选项：科学家还没有确定其功能，谈何clarify
E选项：可以说‘Gum’而不是细菌give an example of how confusion has arisen with regard to the nature of resin
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E选项明明是加强好吗……没读懂题