Mr．Barret 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
网友回答
A. degrees
B. levels
C. limits
(答案→)D. standards
解析：本题考查名词辨析。从上下文的意思分析，此处用 standards，表示“应该遵循的标准” 。句意：以他看来，这是他应该遵循的标准。答案选D。