单项选择题
A.Some stamps have a flower or animal on one side. B.Along with a picture on one side, there are also some words. C.Some used stamps can be worth a lot of money. D.A stamp, when used, is worth more than a new one.
A.India is larger than Antarctica B.The Indian Ocean is to the east of Australia C.Madagascar is larger than Sri Lanka D.The India Ocean is larger than the Atlantic
A.5 percent of the world' s water B.15 percent of the world' s water C.20 percent of the world' s water D.50 percent of the world' s water