发到了以前的贴子上. 再发一遍. 我选D. The quality of unrefined olive oil is not actually defined in terms of acidity, yet extensive tests have shown that the less free oleic acid an unrefined olive oil contains per liter, the higher its quality. The proportion of free oleic acid that an olive oil contains is an accurate measure of the oil’s acidity. 1. 注意第一句的yet, 是反对前面的陈述, 也就是作者认为---The quality of unrefined olive oil should be actually defined in terms of acidity. 这句话应与extensive tests have shown that the less free oleic acid an unrefined olive oil contains per liter, the higher its quality所表达的意思一致. 由此可推出: acidity 就是 free oleic acid 的acidity. 2. The proportion of free oleic acid that an olive oil contains is an accurate measure of the oil’s acidity. 注意accurate. 如果olive oil 还含有其他的acid, 那么The proportion of free oleic acid 就不可能是an accurate measure of the oil’s acidity. 所以, 答案应该是D. |