Read the following text and choose the best answer to fill in the blanks. Coal, oil, and natural gas supply modern
Read the following text and choose the best answer to fill in the blanks.
Coal, oil, and natural gas supply modern civilization (16) __________ most of its power. However, not only are supplies of these fuels limited, but they are a major source of pollution. If the energy demands of the future are to be met without seriously harming the environment, existing (17) __________ energy sources must be improved or further explored and developed. These include nuclear, water, solar, wind, and geothermal power, as well as energy from new, (18) __________ types of fuels. Each of these alternatives, (19) __________, has advantages and disadvantages.
Nuclear power plants efficiently produce large amounts of electricity without polluting the atmosphere; however, they are costly to build and maintain, and they pose the daunting problem of (20) __________ to do with nuclear wastes. Hydroelectric power is inexpensive and environmentally safe, but impractical for communities located far from moving water. Harnessing energy from tides and waves has similar drawbacks. Solar power holds great promise for the future but methods of collecting and – concentrating sunlight are as yet inefficient as are methods of harnessing wind power.
Đáp án đúng là: D
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Đáp án cần chọn là: D
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