阿摩線上測驗
23. The northern lights is essentially
(A) a discharge of electromagnetism from charged particles.
(B) a discharge of protons and electrons from the sun.
(C) a discharge of light from atoms.
(D) a parting of the earth’s magnetic field.
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統計： A(12), B(21), C(98), D(11), E(0) #923651
統計： A(12), B(21), C(98), D(11), E(0) #923651
