15. According to the passage, what happens when electrons and gas collide in space?
(A) The gas becomes more condensed
(B) The gas becomes less radiated
(C) The electrons disperse
(D) The electrons become negatively charged
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統計: A(1), B(0), C(3), D(0), E(0) #803003
統計: A(1), B(0), C(3), D(0), E(0) #803003