单项选择题

Which commercial usage of the Internet does the author NOT refer to

A．Buying airline tickets.
B．Trading stocks.
C．Applying for a credit card.
D．Opening a bank account.
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单项选择题
The last sentence of the third paragraph tells us that ______.
A．any organization's networks may be at risk of security breaches
B．current technology cannot safeguard against unauthorized access to online network
C．information security should be a pressing concern for Internet commerce
D．organizations must secure their networks and data against unauthorized use
单项选择题
Terrorist attacks against American tourists will least probably occur in ______.
A．Iran
B．Cuba
C．Libya
D．Austria
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