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【单选题】
对“人们以历史上前所未有的极大热情研究陨星”的原因，理解恰当的一项是（ ）。
A.
因为在南极的冰面上很容易看见岩石
B.
因为在南极发现的岩石保存得最完好
C.
因为在南极发现的岩石一定都是陨石
D.
因为南极探险激发了人们科研的热情
题目标签：陨星
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参考解析：
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【单选题】There are some earth phenomena you can count on, but the magnetic field, some say, is not one of them. It fluctuates in strength, drifts from its axis, and every few 100,000 years undergoes a dramatic...
A.
Polarity Reversal: A Fantastic Phenomenon of Nature.
B.
Measurement of the Earth’s Magnetic-Field Intensity.
C.
Formation of the Two Poles of the Earth.
D.
A New Approach to the Study of Geophysics.
【单选题】There are some earth phenomena you can count on, but the magnetic field, someday is not of them. It fluctuates in strength, drifts from its axis, and every few 100,000 years undergo, dramatic polarity...
A.
decline
B.
intensify
C.
fluctuate
D.
reverse
【单选题】There are some earth phenomena you can count on, but the magnetic field, someday is not of them. It fluctuates in strength, drifts from its axis, and every few 100,000 years undergo, dramatic polarity...
A.
Polarity Reversal; A Fantastic Phenomenon of Nature
B.
Measurement of the Earth"s Magnetic-Field Intensity
C.
Formation of the Two Poles of the Earth
D.
A New Approach to the Study of Geophysics
【单选题】第三篇 There are some earth phenomena you can count on, but the magnetic field, some say, is not one of them. It fluctuates in strength, drifts from its axis, and every few 100,000 years un...
A.
decline
B.
intensify
C.
fluctuate
D.
reverse
【单选题】第三篇 There are some earth phenomena you can count on, but the magnetic field, some say, is not one of them. It fluctuates in strength, drifts from its axis, and every few 100,000 years un...
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