A. impossible to make B. not very clear in any circumstances C. too obvious to escape observation D. not very difficult to make if enough attention is paid to 参考答案:D 答案解析:[解析] 文章第一段第四句提到,The distinction is as apparent as that…(球场暴力与非暴力的行为之间就像…一样明显,不难加以区分),这正是作者的看法。[D]表达的