75. One reason that rural houses cost more to heat is that ________ .
(A) they are not as well built as modern city houses
(B) they can’t be reached easily
(C) the people who live there are older
(D) more people live there

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統計: A(31), B(48), C(10), D(2), E(0) #3271967

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75. One reason that...
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Key sentence: Winter...
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