46. The main subject of the passage is ________.
(A) the auroras as bad omens
(B) the Earth’s magnetic field
(C) the visible spectacle of the Sun’s solar wind interaction with the Earth’s magnetic field
(D) the infra-red and ultra-violet light show in the Earth’s polar regions
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統計: A(5), B(4), C(73), D(5), E(0) #1566130
統計: A(5), B(4), C(73), D(5), E(0) #1566130