3 Natural gas is one of the safest and cleanest fuels available.It emits less pollution than oth-er fossil fuel sources.When natural gas is burned,it produces mostly carbon dioxide(二氧化碳) and water vapor-the same substances emitted when humans exhale.Compared with some other fos-sil fuels,natural gas emits the least amount of carbon dioxide into the air when combusted(燃烧), making natural gas the cleanest burning fossil fuel of a11.
4 The United States consumes about one-third of the worldS natural gas output,making it the largest gas-consuming region in the world.The U.S.Department of EnergyS Energy Information Ad-ministration forecasts that natural gas demand will grow by more than 50 percent by 2025.
5 There are huge reserves of natural gas beneath the earths surface.The largest reserves of natural gas can be found in Russia,West and North Africa and the Middle East.LNG(液化天然气)has been produced domestically and imported in the United States for more than four decades.
Today,the leading importes of LNG are Japan,Korea,France and Spain.
23.Paragraph 2_________.
24.Paragraph 3________.
25.Paragraph 4_________.
26.Paragraph 5________.
A.Popularity and use of natural gas
B.Natural gas reserves and supply
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