Linux系统中的用户可以分为三类：、系统用户和普通用户。
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Linux中的组有：基本组（主要组）、附加组（补充组）和。
Why does the man want to leave his present job?
A. He wants to earn more money.
B. He wants to work in a much larger company.
C. His present company doesn’t offer him a complete benefits package.
D. His present company doesn’t offer him more opportunities for growth.
What do you know about the man?
A. He’s got a large family.
B. He enjoys playing two kinds of sports.
C. He’s ambitious.
D. He thinks a good benefits package is more important than a high salary.
What can we learn from the conversation?
A. The man is quite sure that he’ll be accepted by the new company.
B. The man can have 15 days off per year if he works in the new company for three years.
C. The man is now working in a very small company.
D. The man earns about $65,000 at his present job.
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