27. A. workers B. drivers C. Cowboys D. farmers
Read the following passage and mark the letter Ay B,c or D on your answer sheet to
indicate the correct answer to each of the questions.
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 efficient 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, hydroelectric power provided one third of the
electricity used in the us, 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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