During the transition of the Earths magnetic fietd,____.
A．compass will become useless
B．man and animals will be confused in directions
C．the magnetic strength of the Earth will disappear
D．the magnetic strength of the Earth will be stronger此题为多项选择题。

A.
A．compass
B.man
C.the
D.the

【参考答案】

B
本题考查考生理解问题的能力，根据文中第三段后半部分的内容可以知道，磁场的减弱会造成磁极的颠倒，这会给依赖磁场......

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