proc import datafile='c:\myexcelfiles\xxx.xls' firstobs=n1 obs=N out=bbb;
proc print data= bbb;
run;

Sorry the first one has error. The following code I checked and it works.
proc import datafile='c:\myexcelfiles\xxx.xls'  out=bbb;
data ccc;
set bbb (firstobs=n1 obs=N) ;
run;
proc print data=ccc;
run;

多谢楼上各位的回复

非常感谢，用你提供的程序，把我的一个问题解决了！

唉...何年何月我才能解决论坛里的求助呢，还是回家好好看书继续学习吧