单项选择题

A．To keep the heat inside.
B．To prevent insects from escaping.
C．To keep the wood dry.
D．To reduce the danger of fire.
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单项选择题
A．It’s cheaper.B．It’s safer.C．It’s quicker.D．It’s easier.
A．It’s cheaper.
B．It’s safer.
C．It’s quicker.
D．It’s easier.
单项选择题
A．Environmental protection.B．Pest control.C．House construction.D．Fire prevention.
A．Environmental protection.
B．Pest control.
C．House construction.
D．Fire prevention.
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