問題詳情
45. The cost of using the sun's light for heating is _____
(A) about the same as the cost of fossil fuels.
(B) several hundred dollars per year.
(C) determined by the temperature of winter.
(D) very cheap compared with other energy sources.
(A) about the same as the cost of fossil fuels.
(B) several hundred dollars per year.
(C) determined by the temperature of winter.
(D) very cheap compared with other energy sources.
參考答案
無參考答案
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