49. The passage does NOT discuss ________.
(A) the electromotive force generated by the interaction between the solar wind and the Earth’s magnetic field
(B) the enhancement of the auroral discharge by gusts of solar wind generated by a solar flare
(C) that auroras result from large-scale electrical discharge processes surrounding the Earth
(D) that the auroral umbra comes from excited, or ionized atoms and molecules

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統計: A(3), B(20), C(16), D(29), E(0) #1566133

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#5628345
umbra (n.) (太陽黑子) 中央...
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這是一道典型的閱讀測驗題目,專門考驗考生...
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