单项选择题
A. cut -d： -f 1，3 /etc/passwd
B. chop -c 1，3 /etc/passwd
C. tac 1-3/etc/passwd
D. fmt -u /etc/passwd
单项选择题 Inxorg.conf，whichsectionisconcernedwithfonts？（）
单项选择题 Given the following output： prompt> myapp [1]+ Stopped myapp prompt> Which of the following commands will resume executing the stopped process while allowing the user to continue to type commands at the command prompt？（）
单项选择题 Toallowaregularuseraccounttomountandunmountafilesystem（forinstance，acdromorfloppy），whichoptionneedtobeaddedtothecorrespondinglinein/etc/fstab？（）