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.