Choose one optionVersion en ligne Look at the image. Then, choose one option. par Profesor Sergio 1 Choose one option a They require little maintenance because they have no moving parts. b They can easily be installed on roofs. c More solar cells can be added to homes if you need extra energy. d Solar cells are also totally silent and non-polluting. 2 Choose one option a They require little maintenance because they have no moving parts. b They can easily be installed on roofs. c More solar cells can be added to homes if you need extra energy. d Solar cells are also totally silent and non-polluting. 3 Choose one option a They require little maintenance because they have no moving parts. b They can easily be installed on roofs. c More solar cells can be added to homes if you need extra energy. d Solar cells are also totally silent and non-polluting. 4 Choose one option a They require little maintenance because they have no moving parts. b They can easily be installed on roofs. c More solar cells can be added to homes if you need extra energy. d Solar cells are also totally silent and non-polluting.
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