【正确答案】正确答案： New Renewable Energy Sources Scientists and engineers are constantly working / to make new renewable energy sources. / Three of the most promising are as follows. / The first one is tidal energy, / which exploits the power of tides to produce electricity. / The next is wave energy, which uses waves from the ocean, lakes, or rivers. / Some wave energy projects use the same equipment that tidal energy projects do. / Other wave energy projects float directly on waves. / The last one is algae fuel, a type of energy / that uses the unique chemicals in seaweed to create a clean and renewable fuel. /