单项选择题

A．He was wondering if the speaker was used to living in America
B．He was trying to show friendliness to the speaker
C．He wanted to keep their conversation going
D．He believed the speaker was a foreigner
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单项选择题
A．It should be raised by soldiersB．It should be raised quickly by handC．It should be raised only by AmericansD．It should be raised by mechanical means
A．It should be raised by soldiers
B．It should be raised quickly by hand
C．It should be raised only by Americans
D．It should be raised by mechanical means
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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