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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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