試題詳解

48 According to the passage, which of the following statements is true?
(A)Solar energy hasn't been widely used until the past few hundreds of years.
(B)More than 50% of the sunlight can be used to meet up our energy demands.
(C)The passive solar energy proves to be particularly effective in colder regions.
(D)The active solar energy with the help of modern technology can be stored for future use.