第21题: [单项选择]某种作业长时间得不到机会运行的现象叫做“饥饿”现象,作业调度算法中可能会造成“饥饿”现象的算法是( )。 A. 先来先服务算法 B. 最短作业优先算法 C. 最高响应比作业优先算法 D. 均衡调度 参考答案:B 答案解析:[解析]最短作业优先算法可能会造成“饥饿”现象,由于该算法只考虑作业运行时间而完全忽略了作业等待时间的长短,因此有可能发生一个长作业进入系统后,由于不断有较短的作业进入系统,使它一直得不到机会运行。
第35题: [单项选择]Questions 23 to 25 are based on the conversation you have just heard.[A] She preferred homestay families. [C] She didn’t like her cousin. [B] Her aunt needed the room for her cousin. [D] Her aunt didn’t like her. 参考答案:B 答案解析:[听力原文]23-25 M: Sara, I’ve heard that you want to move into a homestay family. Is that correct