【单选题】 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.
网考网参考答案：B
网考网解析：
只要看清第四段第二行就可选对答案。
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