46 According to this passage, how often does El Niño occur?
(A)every two years
(B) every three years
(C) every four years
(D)every five years

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統計： A(97), B(186), C(1683), D(78), E(0) #1807519

Meggy

B1 · 2018/06/29

#2884369

El Niño is a mysterious weather pattern. It begins about every four years with a sudden warming of the eastern Pacific Ocean along the equator.

El Niño 聖嬰現象

Pacific Ocean 太平洋

equator 赤道

46 According to this passage, how often does El Niño occur? (A)every two years (B) every three years (C) every four years(D)every five years