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.
ATropical climate.
BPolitical unrest.
CFood crisis.
DDisease.
A7 million people
B25 million people
C33 million people
D17 million people
AYou likely go to school with kids of your gender only.
BYou may receive about 2 hours of instruction on the Koran per week.
CGender segregation in schools has been the norm.
DWomen are required to serve in the military after 18.
AChina should open to the outside world because it has a large population.
BChina benefits a lot from the opening up.
CChina’s opening-up is unique with a large population.
DChina is a country with 1.4 billion people.
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