38. The main idea of this passage is that _____.
(A)people refuse to live in underground homes
(B)insulation is a decisive factor in building an underground home
(C)underground home construction involves several engineering feats
(D)underground homes offer an alternative to traditional homes

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統計： A(2), B(3), C(11), D(59), E(0) #3445936

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【題組】38. The main id...
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