It can be learned from the passage that the Ouchidas’ house______. Why were cracks in old houses not a big concern?

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问题 It can be learned from the passage that the Ouchidas’ house______.
Why were cracks in old houses not a big concern?

选项 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.

答案B

解析 只要看清第四段第二行就可选对答案。
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