题目内容
（请给出正确答案）
[主观题]
Why were cracks in old houses not a big concern？A．Because indoor cleanness was not emphasi
Why were cracks in old houses not a big concern？
A．Because indoor cleanness 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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