71. We are looking for a cheap, clean, effective source of power that doesn't cause pollution or waste natural resources.
72. At present, most of our electricity comes from the use of coal, gas, oil, or nuclear power.
73. This power could be provided by the sun.
74.One percent of the solar energy that reachs to the earth is enough to provide power for the total population.
75. Many countries are already using solar energy.
Đúng 0
Bình luận (1)
