题目内容

2. Lisa has three _______.

A. brother-in-law
B. brothers-in-law
C. C. brother-in-laws
D. brothers-in-laws

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Part I Vocabulary and Structure (1’x20)Directions: In this section, there are 20 incomplete sentences. You are required to complete each one by deciding on the most appropriate word or words from the 4 choices marked A), B), C) and D). Then you should mark the corresponding letter on the answer sheet with a single line through the centre.1. The number of people invited fifty, but a number of them abent for different reasons.

A. were;was
B. was;was
C. was;were
D. were;were

物理页帧数量为4，虚拟页访问序列为 0,3,2,0,1,3,4,3,1,0,3,2,1,3,4 ，请问采用CLOCK置换算法（用2个bit表示存在时间）的缺页次数为（）

A. 7
B. 8
C. 9
D. 10

物理页帧数量为5，虚拟页访问序列为 4,3,0,2,2,3,1,2,4,2,4,0,3，请问采用缺页率置换算法（窗口T=2）的缺页次数为（）

A. 2
B. 8
C. 4
D. 5

物理页帧数量为5，虚拟页访问序列为 4,3,0,2,2,3,1,2,4,2,4,0,3，请问采用工作集置换算法（工作集窗口T=4）的缺页次数为（）

A. 2
B. 8
C. 4
D. 5