单项选择题

A．He was a relative of the speaker’’s.
B．He was a friend of the speaker’’s.
C．He eventually made his way out of the building.
D．He worked in the south tower of the World Trade Center.
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单项选择题
A．Graduate students.B．Undergraduate students.C．Professors.D．Library employees.
A．Graduate students.
B．Undergraduate students.
C．Professors.
D．Library employees.
单项选择题
An operating system is no guarantee of online security probably because ______.
A．some OS suppliers are not trustworthy
B．it still fails to shield users from intrusions
C．antivirus software is not updated in due time
D．some terminals are not installed with such a system
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