单项选择题

According to the passage, which of the following groups of numbers will certainly bring good luck to people

A．3 and 7.
B．3 and 9.
C．7 and 9.
D．3 and 13.
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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 networks
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
Which commercial usage of the Internet does the author NOT refer to
A．Buying airline tickets.
B．Trading stocks.
C．Paying bills.
D．Opening a bank account.
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