AThe problem of extracting methane hydrates is retrieving methane gas and bringing it to the surface.
BIt is very easy to find methane hydrates.
COnly Japan wants to extract methane hydrates.
DMethane hydrates are a major source of fuel in Japan.
AThey grow in seawater.
BThey grow more slowly than other trees.
CThey grow good-quality fruits.
DThey are ideal for shade.
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