用户dog登录了Linux系统，而当前的工作目录并不是他的家目录，请问他可以使用如下的哪些命令切换回他的家目录？
A. cd
B. cd ..
C. cd ~
D. cd /home
E. cd ../~
F. cd $HOME
查看答案
用户dog在Linux操作系统上使用命令cp -f ~/girldog /tmp/girldog，请问在以下有关这一命令的陈述中，哪些是正确的？
A. /dog/girldog文件被复制到/tmp/girldog目录中
B. 如果/tmp/grildog已经存在并是一个文件，它将被覆盖
C. dog用户家目录中的girldog文件将被复制到/tmp/girldog中
D. 如果/tmp/girldog不存在，~/girldog文件将被复制为/tmp/girldog
Question 1[音频]
A. He was very active in community service
B. He did quite well in mathematics and science
C. He had excellent records in almost all subjects
D. He searched for information to keep himself busy
Question 2[音频]
A. Because he met a programmer called Allen there
Becuase he joined Information Sciences Inc. there
C. Because he liked the serious academic environment there
D. Because it was there he had his first contact with a computer
Question 3[音频]
A. Harbard University made him feel bored
B. Harvard University aroused his interest in programming
C. Harvard University gave him new ideas for future projects
D. Harvard University made him devoted to serious academic work
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