单项选择题


A．sources
B．resources
C．credits
D．origins
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单项选择题
This passage is devoted to introduction to ______.
A．the causes and effects of El Nino weather phenomena
B．the worldwide monitoring network set up to predict El Nino
C．the relationship between the ocean temperatures and climate patterns
D．El Nino phenomena and destructive effects of one El Nino event on Ica
单项选择题
El Nino is a warm ocean current ______.
A．which centers on America and Africa
B．which was named by an American
C．which kills many people every time
D．which has side-effects all over the world
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