单项选择题

A．On Friday.
B．On Saturday.
C．On Thursday.
D．On Wednesday.
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单项选择题
A．Every room has a heater.B．The Central room has a heater.C．A heat chamber heats air and passes the warm air through ducts and openings into rooms.D．The rooms are installed with blowers or convection.
A．Every room has a heater.
B．The Central room has a heater.
C．A heat chamber heats air and passes the warm air through ducts and openings into rooms.
D．The rooms are installed with blowers or convection.
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