问题补充:
Mr. Barren doesn’t think that all bad language should be allowed. In his opinion, there are that should be kept up.
A. degrees
B. levels
C. limits
D. standards
答案:
A. degrees
B. levels
C. limits
(答案→)D. standards
解析:定语从句that should be kept up 中的keep up 表示“保持、维持、坚持”。根据前一句的逻辑推理:Barren 先生认为我们不能容忍所有骂人的话,可以推断出“需要维持一定的标准、准则。”