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单项选择题
Why is insulation required in new houses
A．To limit heating bills.
B．To prevent heat loss.
C．To determine the temperature in homes.
D．To convert homes to electric heat.
单项选择题
Beethoven was distressed by his nephew’s ______.
A．extravagance
B．unwillingness to do his best
C．joining the army
D．failure to enter polytechnic school
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