Cars can be more fuel efficient by utilizing ultralight and ultrastrong materials in their design.
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Q47: Photovoltaic solar cells work on cloudy days.
Q48: Electric-gasoline powered vehicles are called _.
Q49: We can make energy use more sustainable
Q50: Energy efficiency measures are applied only to
Q51: Keeping energy prices artificially low has resulted
Q53: _ is based on energy-efficient and money
Q54: Hydropower can only be generated in large-scale
Q55: Green roofs could be used in office
Q56: Geothermal heat pumps may be used to
Q57: Energy conservation is best achieved through _.
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