Để giúp các bạn học sinh củng cố lại phần kiến thức đã học, biết cấu trúc ra đề thi. Đề kiểm tra 1 tiết HK 2 môn tiếng Anh lớp 11 năm 2017-2018 - THPT Gia Nghĩa - Mã đề 308 dưới đây để có thêm tài liệu ôn thi. | 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 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 to day 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.
