第19题: [单项选择]关于光电效应的发生概率正确的是() A. 大约和能量的三次方成反比 B. 大约和能量的四次方成正比 C. 和原子序数的四次方成反比 D. 和原子序数的三次方成正比 E. 和管电流成正比 参考答案:A
第20题: [单项选择]What most probably is true about the woman A. She works in the store. B. She knows the way to the store. C. She is a traveler. 参考答案:C 答案解析:[听力原文] F: Excuse me, is it still far away to the store M: No... just few miles.