单项选择题

This passage is most probably take from an article entitled" ______ ".

A．Energy Conservation
B．House Building Crisis
C．Air Pollution Indoors
D．Traps in Building Construction
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单项选择题
What made the Ouchidas' new house a horrible dream
A．Lack of fresh air.
B．Poor quality of building materials.
C．Gas leakage in the kitchen.
D．The newly painted walls.
单项选择题
Why were cracks in old houses not a big concern
A．Because indoor cleanliness was not emphasized.
B．Because energy used to be inexpensive.
C．Because environmental protection was given top priority.
D．Because they were technically unavoidable.
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