5. To use the Internet for education is ________________.
a. impossible b. possible
c. inconvenient d. difficult
ĐỀ 05
The search of alternative resources of energy has resulted in different directions. Many
communities are burning garbage and other biological waste products to produce
electricity.
Experimental work is being done to make synthetic fuels from coal, or coal tars. But to
date, that process has proved expensive. Some experts are trying to revive hydroelectric
power which is 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
four percent. The oceans are another source of energy. Scientists are studying ways to
change the energy of ocean currents, tides, and waves into electricity.
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