The most important form of energy is electric energy, which is ______ used in our daily life.
A. wide
B. widen
C. widely
D. unwide
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In the smart cities, communication will be ______ than it is today via digital technology.
A. fast
B. faster
C. fastest
D. fasten
Electric vehicles will save a lot of air ______ because there will be no emission of CO2 in the air.
A. pollute
B. polluted
C. pollution
D. polluting
According to the WHO, the number of people living in cities ______ to almost double over the next few decades.
A. expect
B. expected
C. is expected
D. is expecting
采用LRU替换算法的页式虚拟存储器共有9页空间准备分配给A、B两道程序。已知B道程序若给其分配4页时,命中率为8/15;若分配5页时,命中率可达10/15。现在给出A道程序的页地址流为2、3、2、1、5、2、4、5、3、2、5、2、1、4、5。(1)画出用堆栈对A道程序页地址流的模拟处理过程图;(2)统计给其分配4页和5页时的命中率。