10. A. locking B. putting C. endangering D. limiting
B. Read the passage then choose the most suitable answer for each question
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 products to gases
or oil is also an effective way to dispose of wastes.
Experimental work is being done to derive synthetic fuels from coal, oil shale, and coal tars. But to date,
that process has proven expensive. Other experiments are underway to harness power with giant windmills.
Geothermal power, heat from the Earth, is also being tested.
Some experts expect utility companies to revive hydroelectric power derived from streams and rivers.
Fifty years ago hydro-electric power provided one-third of the electricity used in the United States, but today it
supplies only 4 percent. The oceans are another potential source of energy. Scientists are studying ways to
convert the energy of ocean currents, tides, and waves to electricity. Experiments are also underway to make
use of temperature differences in ocean water to produce energy.
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