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 cleanliness was not emphasized.
B、Because energy used to be inexpensive.
C、Because environmental protection was given top priority.
D、Because they were technical unavoidable.

答案B

解析 根据第四段第二句“在过去能源便宜的年代,建房者不太在意没有封起来的缝隙。”故B为答案。
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