单项选择题

A．Searching for reference material.
B．Watching a film of the 1930s.
C．Writing a course book.
D．Looking for a job in a movie studio.
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单项选择题
A．About 45 million.B．About 50 million.C．About 5.4 million.D．About 4.5 million.
A．About 45 million.
B．About 50 million.
C．About 5.4 million.
D．About 4.5 million.
填空题
Generally, complex computer models can successfully predict El Nino
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