请教一下base 123 中的两道题：
79.
The following SAS program is submitted:
data work.products;
Product_Number=5461;
Item = '1001';
Item_Reference=Item||'/'||Product_Number;
run;
Which one of the following is the value of the variable ITEM_REFERENCE in the
output data set?
A. 1001/5461
B. 1001/ 5461
C. . (missing numeric value)
D. The value can not be determined as the program fails to execute due to errors.
答案为B
不太明白为什么5461前面会有空格呢？

103.
The following SAS program is submitted:
options pageno = 1;
proc prient data=sasuser. houses;
run;
proc means data=sasuser .shoes;
run;
The report created by the PRINT procedure step generates 5 pages of output.
What is the page number on the first page of the report generated by the MEANS
procedure step?
A. 1
B. 2
C. 5
D. 6

答案为D
不太清楚pageno=1的用法，是不是在第二行写了就只对下一行的proc print有用呢？

谢谢大家！