诚心请教两题，多谢。
第一题
Given the following OPTIONS statement:
libname A 'SAS library reference';
libname F 'SAS library reference';
options fmtsearch = (A F.X);
What is the second location searched for formats?
A.F.X
B.A.FORMATS
C.WORK.FORMATS
D.SAS supplied formats
为啥答案是c, 问的是second location 呀？

第二题
The following SAS program is submitted:

  %macro COLS1;
     Name Age;
  %mend;      
  %macro COLS2;
     Height Weight;     
  %mend;      
  proc print data=SASHELP.CLASS;
     [_insert_VAR_statement_here_]      
  run;

  Which VAR statement successfully completes   
  the program to produce a report containing   
  four variables?


A. var %COLS1 %COLS2;     
B. var %COLS1-%COLS2;     
C. var %COLS1 Weight Height;      
D. var Weight Height %COLS1;   
为什么答案是d? 请解释一下原因。