单项选择题

What command will print a list of usernames （first column） and their corresponding user id （uid， third column） from /etc/passwd？（）

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

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单项选择题
Inxorg.conf，whichsectionisconcernedwithfonts？（）

A. the Fonts section
B. the Files section
C. the xfsCodes section
D. the Graphics section
E. the modeline section
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？（）

A. bg myapp
B. continue myapp
C. exec myapp
D. fg myapp
E. myapp &
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