57. Which of the followingis true about the COMPRESS=YES data set option?      

A. It uses the Ross Data Compression method to compress numeric data.  

B. It is most effective with character data that contains repeatedcharacters.  

C. It is most effective with numeric data that represents large numericvalues.   

D. It is most effective with character data that contains patterns, ratherthan simple repetitions.  

这个题目考试的时候遇到了，答案说是B， crackman上的答案说是D

我自己感觉是B，因为crackman上的英文解释我个人理解还是在一种repeated理解层面上。

53.The SASFILE statementrequests that a SAS data set be opened and loaded into memory:   A. one page at a time.    B. one variable at a time.C. one observation at a time.      D. in its entirety, if possible.   
这个题目，答案说是D，但是crackman上说是A， 我个人而言同意Crackman的，因为online tutor上却是有提到page是unit的问题。
最后感谢朋友载我20mile带我去考试，而且还得早起。