单项选择题

A．To limit discussion on heating bills.
B．To prevent heat loss.
C．To determine the temperature in homes.
D．To convert homes to electric heat.
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单项选择题
A．Very few were produced.B．Most were kept only a short time.C．Most were pointed on delicate paper.D．Many have been acquired by collectors.
A．Very few were produced.
B．Most were kept only a short time.
C．Most were pointed on delicate paper.
D．Many have been acquired by collectors.
单项选择题
A．Bicycles and cars.B．Building codes.C．Energy conservation.D．New housing construction.
A．Bicycles and cars.
B．Building codes.
C．Energy conservation.
D．New housing construction.
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