19、
5. For as long as three months of a year, on the ice-covered land of Alaska can ________ be found day and night.
6. According to statistics, ___________of the total area of Alaska has been used for farming.
7. Alaska was originally part of Russia, but was bought by ____________.
8. Gold brought less wealth to Alaska than ______________.
A. as fish does
B. because of its rich natural resources
C. by the United States in the 19th century
D. shines day and night
E. only a very small percentage
F. a limited amount of the gold found there
标准答案： D,E,C,A
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