Scientist reported last month on a sign of relative solar ____

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Scientist reported last month on a sign of relative solar _____; the solar wind, a rush of charged particles continually spewed from the Sun at a million miles an hour, had diminished to its lowest level in 50 years.

A、quiescence
B、turbulence
C、isolation
D、calm
E、remoteness
F、instability

答案：A,D

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