单项选择题

Animals are good for old people’s health in the sense that animals ______.

A．can look after them in hospital and home
B．can be their good companions
C．are more reliable than people
D．can help them establish more social contacts
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单项选择题
According to experts on sleepwalking, sleepwalkers ______.
A．can commit murder or other dangerous things
B．can be fatally hurt if they are wakened abruptly
C．are partially awake
D．are immune to injury
单项选择题
The price fluctuation of crude oil is caused by ______.
A．changed market demand
B．changed OPEC policy
C．security situation in Saudi Arabia
D．U.S, policy toward Saudi Arabia
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