单项选择题

A．rare
B．difficult
C．basic
D．mere
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单项选择题
A．inB．underC．overD．beyond
A．in
B．under
C．over
D．beyond
单项选择题
Why is insulation required in new houses
A．To limit discussion on heating bills.
B．To determine temperature in homes.
C．To prevent heat loss.
D．To convert homes to electric heat.
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