单项选择题

Animals are good for old people's health because animals ______.

A．can look after them
B．can be their good companions
C．are more reliable than people
D．can help them with housework
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单项选择题
The background music as mentioned in the conversation is ______.
A．such music as is played in concerts
B．the music that is played only in restaurants and stores
C．the music that is played to promote production
D．music played in the background to put you in a particular mood
单项选择题
According to Howard, background music ______.
A．can possibly give people better feelings
B．increases production by 4.5 percent in factories
C．is sometimes very boring to the workers
D．is always faster than any other music
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