单项选择题

According to the passage, if the price in the machine is too high, the cause(s) may be______.

A．a computer error
B．carelessness
C．dishonesty
D．B or C
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单项选择题
People who are cognitively healthy are those______.
A．who can remember large amounts of information
B．who are highly intelligent
C．whose minds are alert and receptive
D．who are good at recognizing different sounds
单项选择题
Grocery store price lists are updated by______.
A．a scanner
B．a telephone hookup
C．an adding machine
D．an employee
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