题目内容：
根据下面内容，回答题：Alaska, which was called Russian America before it was sold to the United States of America,
joined the union as the forty-ninth state in 1959.
Alaska is now the largest of all the 50 states of the United States.
It was in 1867 that President A. Johnson's Secretary of State ( 国务卿 ), Seward bought Alaskafrom the Russians at a cost of 7.2 million. The buying of the huge northern land mass seemed at firstsomething foolishly done. Not only was Alaska difficult to reach, but it was also hard to live in, and itappeared to have no importance in time of war. Besides, there are volcanoes there as Alaska lies onthe Pacific "ring of fire" (火山带). In Alaska large treeless areas are covered with snow all theyear. For these reasons the buying of Alaska was called "Seward's Fooly" at that time.
However, in 1596 gold was found in Alaska,and people poured into the land quickly. Since thenother important natural resources were discovered, including oil. Soon people changed their thinkingabout "Seward's Fooly". But most people visit Alaska in order to see the endless beauty of naturethat the northern land discloses to them. For instance ,there are about 11,000 islands in Alaska. Andin a certain area of Alaska the sun does not set for 52 days every year.
Alaska belonged to_________ before 1867. A．Russia
B．America
C．Canada
D．Japan
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