单项选择题

A．To find articles on ecology.
B．To look into some of the specilialized indexes.
C．To look for articles published in 297 periodicals.
D．To look for articles published from November 10th,1990 to December 28th,2000.
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单项选择题
A．the US OpenB．the Australian OpenC．the French OpenD．the Hongkong Championship
A．the US Open
B．the Australian Open
C．the French Open
D．the Hongkong Championship
单项选择题
One of the characteristics that have made Mark Twain a major literary figure in the 19th century America is his use of ______.
A．vernacular
B．interior monologue
C．unique point of angle
D．photographic description
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