单项选择题

According to the text, computer chips have already been used to ______.

A．catch escaped prisoners
B．find missing children
C．follow lost animals
D．treat sick people
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单项选择题
Guests who are unfamiliar with table manners often appear at dinner patties feeling ______.
A．improper
B．regretful
C．uncertain
D．dissatisfied
单项选择题
The writer wrote the text because he has noticed that good table manners ______.
A．are completely forgotten by young people
B．are brought back to people's attention
C．are used when making professional decisions
D．are difficult to learn and practise
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