单项选择题

We are told that a high-tech cash register is really just______.

A．an electric instrument of sight.
B．a simple adding machine.
C．a way to keep employees honest.
D．an expensive piece of window dressing.
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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
Older people are generally advised to______.
A．keep fit by going in for physical activities
B．keep mentally active by challenging their brains
C．maintain mental alertness through specific training
D．maintain a balance between individual and group activities
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