7. Millions of people were treated to an extremely rare cosmic show as powerful geomagnetic storms triggered spectacular _______ to erupt across the skies.
(A) aurorae
(B) illusion
(C) meteorite
(D) zenith
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統計: A(1), B(0), C(2), D(2), E(0) #3910943
統計: A(1), B(0), C(2), D(2), E(0) #3910943