单项选择题

The balances on their operating statements can not be called profits or losses, rather they are called surpluses or ______.

A．defect
B．handicap
C．deficit
D．flaw
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单项选择题
Some companies are limiting the risk by conducting online ______ only with established business partners who are given access to the company's private intranet.
A．stimulation
B．transactions
C．transitions
D．solutions
单项选择题
It is important that employees stick to their company's security policies because ______.
A．they are the ultimate users of the network
B．everyone will have to follow the rules anyway
C．they often make errors in operating their systems
D．security breaches are often caused by their blunders
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