参考答案:C
[听力原文] M: Tickets are four dollars for adults. Children’s tickets are half price. W: Okay. I’d like two adults and children’ tickets, please.
导致信息安全问题的因素众多,如计算机硬件故障、计算机病毒、黑客攻击、截收计算机电磁波窃听或搭线窃听等等。大体上可以分为物理和人为两大类。
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