为文件和目录指定权限时要慎重，只有在具有充分的理由时再将访问权限授予他人。
A. 对
B. 错
chown tom:mary 1.jpg 指令是不对的，因为属主和属组不一致。
A. 对
B. 错
What can we learn from the news report?
A. World Trade Center is going to be rebuilt.
B. New York City has been under attack recently.
C. Last search dog from Twin Towers attack died.
D. Survivors of airplane crash are seeking for help.
How old did Bretagne retire from her active duty?
At age 2.
B. At age 9.
C. At age 10.
D. At age 16.
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