单项选择题

A．To move muscles.
B．To early different messages.
C．To protect the nerves.
D．To control nerve cells.
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单项选择题
A．The woman should ask the man by the door.B．The woman should get off immediately.C．He will tell the woman when to get off.D．The woman should check the map.
A．The woman should ask the man by the door.
B．The woman should get off immediately.
C．He will tell the woman when to get off.
D．The woman should check the map.
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