The author mentions the sources of energy such as wind, steam, petrol in the first paragraph to _ . A. suggest that electricity should be alternated with safer sources
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The author mentions the sources of energy such as wind, steam, petrol in the first paragraph to
suggest that electricity should be alternated with safer sources of energy
emphasize the usefulness and adaptability of electricity
imply that electricity is not the only useful source of energy
discuss which source of energy can be a suitable alternative to electricity