单项选择题

The word "staple" ( Line 1 , Para. 1 ) probably means "______".

A．big problem
B．tough job
C．important part
D．special item
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单项选择题
It can be inferred from the passage that El Nino first appeared in ______.
A．Pacific
B．Peru
C．South America
D．Africa
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
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