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为实现设备分配,系统中应配置①和_②的数据结构;为实现控制器和通道的分配,系统中还应配置③和_④的数据结构。

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下列磁盘调度算法中,平均寻道时间较短,但容易产生饥饿现象的是(A);电梯调度算法是指(B);能避免磁臂粘着现象的算法是(C)。 A,B,C:（1) SSTF;(2)FCFS:(3)SCAN;(4)CSCAN;(5) FSCAN。

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大脑消耗的是（）。

A. 脂肪
B. 糖类
C. 蛋白质
D. 维生素

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人类所食用的食品基本上没有天然食品。

A. 对
B. 错

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Part I Listening ComprehensionSection ADirections: In this section, you will hear two news reports. At the end of each newsreport, you will hear two questions.Both the news report and the questions will be spokenonly once. After you hear a question, you must choose the best answer from the fourchoices marked A), B), C) and D).[音频]Questions 1 and 2 will be based on the following news item.[音频]1. A)They make up around 80 percent of the young people.B) They are five times the number of five years ago.C) They are hit by vehicles in streets in surging numbers.D) They are involved in the campaign across the country.2. A) Putting up warning signs.B) Stopping car drivers using phones.C) Dealing with pedestrian injuries.D) Recording smartphone-related accidents.

A. They make up around 80 percent of the young people.
B. They are five times the number of five years ago.
C. They are hit by vehicles in streets in surging numbers.
D. They are involved in the campaign across the country.

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