楼主小白，想请教各位巨巨一道题！谢谢啦！
81. at the start of a new SAS session, the following program is submitted:
%macro one;
data_null_;
call symput('proc','means');
run;
proc &proc data=sashelp.class;
run;
%mend;
%one();
答案是the macro variable PROC is stored in the global symbol table，请问为什么不是local symbol table呢？