单项选择题

The most effective complaint can be made by ________.

A．showing the faulty item to the manufacturer
B．explaining exactly what is wrong with the item
C．saying firmly that the item is of poor quality
D．asking politely to change the item

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单项选择题It can be concluded from the passage that ________.

A．it is still impossible to detect computer crimes today
B．people commit computer crimes at the request of their company
C．computer criminals escape punishment because they can't be detected
D．computer crimes are the most serious problem in the operation of financial institutions

单项选择题Which of the following statements is mentioned in the passage

A．A strict law against computer crimes must be enforced
B．Companies usually hesitate to uncover computer crimes to protect their reputation
C．Companies will guard against computer crimes to protect their reputation
D．Companies need to impose restrictions on confidential information