单项选择题
What do the changes in radio signals correlate with
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A．The sun"s atmosphere.
B．Changes in the number of sunspots.
C．The sun"s photosphere.
D．The calcium areas of the sun"s spectrum.
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单项选择题
What causes great intensity of radio signals
A．The x-rays and atomic particles.
B．The thermal activity in core.
C．The ultra-violet rays.
D．Other gases on the surface of the sun.
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