单项选择题

A．Health care and housing problems.
B．Education and transportation problems.
C．Transportation and employment problems.
D．Education and employment problems.
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单项选择题
A．Supplying blood for people who need. B．Providing a number of services for the public. C．Helping the sick and wounded during the war. D．Aiding people who were injured in an earthquake.
A．Supplying blood for people who need.
B．Providing a number of services for the public.
C．Helping the sick and wounded during the war.
D．Aiding people who were injured in an earthquake.
单项选择题
A．The platform workers. B．The computers. C．The command spots. D．The machines.
A．The platform workers.
B．The computers.
C．The command spots.
D．The machines.
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