Question

the sihwa lake tidal power station in south korea is the worlds largest tidal power plant. opened in 2011, the plant uses a seawall and 10 turbines to generate electricity from the natural movement of ocean tides. it produces about 552 gwh of clean energy annually, enough to power around 500,000 homes. as one of the first successful examples of tidal power technology, the sihwa lake plant demonstrates the potential for large - scale use of this energy source. which choice best states the main idea of the text? choose 1 answer: a the sihwa lake tidal power station uses a seawall and turbines to generate electricity from the natural movement of ocean tides. b the sihwa lake tidal power station is an example of tidal energy technology operating successfully at a large scale. c the sihwa lake tidal power station does not generate as much power as power plants that use different types of renewable energy. d the sihwa lake tidal power station is able to produce enough energy to power 500,000 homes.

Explanation:

The text introduces the Sihwa Lake Tidal Power Station as the world's largest tidal power plant. It mentions its operation (using seawall and turbines), energy production (552 GWh annually), and its significance as "one of the first successful examples of tidal power technology" that "demonstrates the potential for large - scale use of this energy source".

• Option A only focuses on how it generates electricity (using seawall and turbines), which is a part of the details, not the main idea.
• Option C: There is no comparison with other renewable - energy power plants in the text, so this option is incorrect.
• Option D only highlights the energy output (powering 500,000 homes), which is also a detail.
• Option B captures the overall significance of the power station as a successful large - scale example of tidal energy technology, which aligns with the main idea of the text.

Answer:

B. The Sihwa Lake Tidal Power Station is an example of tidal energy technology operating successfully at a large scale.