E选项有个明显的错误
前一句主语是usage of spices, 后一句的they 指代的是spices, 按比较对象平行的准则的话,改成这样应该就没问题了?
In cooking, the usage of spices is in small quantities, whereas in medicinal usage *it is* in large quantities.
定位第一段costs per unit of output fall as plant size approaches "minimum efficient scale," &第二段but rather by the first to exploit the full potential of such plants.
方案的可行性,因为老机器不能百分百有效,所以还是需要新机器,所以提高了方案的可行性