问题详情

We can learn from the beginning of the text that EI Nino is a phenomenon______
A．which occurs in some areas other than the Pacific.
B．whose effects direct winds to move to the poles.
C．which human activities are chiefly responsible for.
D．whose causes remain a mystery to human beings.此题为多项选择题。请帮忙给出正确答案和分析，谢谢！