选 D 呀，简单重复的太少了，模式比较多

收到，谢谢啦

为什么参考答案是B

Pre_Guide_Advanced_for_SAS_9_第四版686 页：
Not all data files are good candidates for compression.However, compression can be
beneficial when the data file has one or more of the following properties:
• It is large.
• It contains many long character values.
• It contains many values that have repeated characters or binary zeros.
• It contains many missing values.
• It contains repeated values in variables that are physically stored next to one another.
显然 B最符合