Câu 27: A. distribute B. stimulate C. subscribe D. affect
Choose the item among A. B. C. or D. that best answer the questions about the passage:
T
he 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 efficient way to dispose [arrange] of wastes.
Experiment work is being done to derive [gain] synthetic [combining] fuels from coal, oil
shale, and coal tars [nhựa]. But to date, that process has proven expensive. Other experimental are
underway to harness [tận dụng] 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 hydroelectric 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, 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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