阿摩線上測驗
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.
答案：登入後查看
統計： A(1), B(1), C(0), D(8), E(0) #2337120
統計： A(1), B(1), C(0), D(8), E(0) #2337120
