单项选择题

In Peter Oslo's opinion the French experiment

A．is likely to direct further research in the inner physics of the earth
B．has successfully solved the mystery of polarity reversals
C．is certain to help predict external disasters
D．has caused great confusion among the world's geophysicists

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热门试题

单项选择题

The French geophysicists' study is different from currently prevailing theories in ______.

A．its identification of the origin of the earth's magnetic field
B．the way the earth's magnetic intensity is measured
C．its explanation of the shift in the earth's polarity
D．the way the earth's fluctuation rhythm is defined

单项选择题

What have the two French geophysicists discovered in their research

A．Some regularity in the changes of the earth's magnetic field.
B．Some causes of the fluctuation of the earth's magnetic field.
C．The origin of the earth's magnetic field.
D．The frequency of polarity reversals.