THIS STORY TELLS.A. ABOUT THE FIRST MEN TO WALK ON THE MOONB. HOW M...
63.This story tells.
A. about the first men to walk on the moon
B. how men found footprints on the moon]
C. what the men brought back from their trip to the moon
D. who had left footprints on the moon before the two men landed there.
Read the text carefully and then choose the correct answer:
The search for alternative sources of energy has led in various directions.
Many communities are burning garbage and other biological waste products to
produce electricity. Converting waste product to gases or oil is also an efficient way
to dispose of waste.
Experimental work is being done to derive synthetic fuels from coal, old shale
and coal tars. But today, that process has proved expensive. Other experiments are
underway to harness power with giant windmills Geothermal power, heat from the
earth, is also being treated.
Some experts utility companies to revive hydroelectric power derived from
steam and rivers. Fifty years ago hydroelectric power provides one third of the
electricity used in the United State, but today it supplies only four percent. The
oceans are another potential source of energy. Scientists are studying ways to covert
the energy of ocean currents, tides and waves to electricity. Experiments are also
underway to make use to temperature differences in ocean water to produce energy.
Of ocean currents, tides and waves to electricity. Experiments are also underway to
make use to temperature differences in ocean water to produce energy.