The author mentions the sources of energy such as wind, steam, petrol in the first paragraph to ____________

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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

Giải thích

Đáp án B

Dẫn chứng “Today we take electricity for granted and perhaps we do not realize just how useful this discovery has been.”