作者：英吉
Tanco, a leather manufacturer, uses large quantities of common salt to preserve animal hides. New environmental regulations have significantly increased the cost of disposing of salt water that results from this use, and, in consequence, Tanco is considering a plan to use potassium chloride in place of common salt. Research has shown that Tanco could reprocess the by-product of potassium chloride use to yield a crop fertilizer, leaving a relatively small volume of waste for disposal.
In determining the impact on company profits of using potassium chloride in place of common salt, it would be important for Tanco to research all of the following EXCEPT:
A. What difference, if any, is there between the cost of the common salt needed to preserve a given quantity of animal hides and the cost of the potassium chloride needed to preserve the same quantity of hides?
B. To what extent is the equipment involved in preserving animal hides using common salt suitable for preserving animal hides using potassium chloride?
C. What environmental regulations, if any, constrain the disposal of the waste generated in reprocessing the by-product of potassium chloride?
D. How closely does leather that results when common salt is used to preserve hides resemble that which results when potassium chloride is used?
E. Are the chemical properties that make potassium chloride an effective means for preserving animal hides the same as those that make common salt an effective means for doing so?
题目分析：A说用两种方法之间的成本差距是否存在，原文反复谈的就是两种方法哪个省钱，有关，杀。（问的是except）B说用盐的设备是否能用于PC，不好说，先留着（有点像无关）C说环境法规处理by product，原问提到过，有关，杀。D说用盐的效果和用PC的效果是否类似，不好说，留着E说用PC方法里面的化学物质是否和用盐里面的化学物质一样，也留着。剩下来的选项我们看看问题，问题问的是用pc代替盐，我们要想决定效果如何，我们会调查什么？不会调查什么？我们考虑设备是否继续能沿用（B）听着合理，我们考虑保存效果是否理想也合理(D)，我们调查两种方法的化学物质听起来就很2，问的还是except，那就选这个2的选项.
