单项选择题

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
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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
单项选择题
The space agencies are reluctant to open up space to tourists.
A．Y
B．N
C．NG
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