【简答题】圣诞树上藏有q个红色魔球,3个黄色魔球,找到任人个魔球的可能性都是 1 8 .…______.
【单选题】在操作系统中,构成访问控制的主要概念包括权限、对象审查和()
【简答题】Everything is developing so quickly in today’s world that I am afraid I cannot _____ all the changes.
【单选题】I am afraid four hour's time is not _____ for us to see all the places in the park.