听力原文: New York City is the largest city in the United States. Unlike most American cities, which make up only a part of a particular county, New York City is made up of five separate counties, which are called boroughs. They are Manhattan, Queens, Brooklyn, Bronx and Staten Island.
Manhattan, or New York County, is the smallest of the five boroughs, covering an area of 59.5 sq km (23 sq mi). It is the glittering heart of the metropolis. It is the site of virtually all of the hundreds of skyscrapers that are the symbol of the city. Among the more famous of these are the Empire State Building, the Chrysler Building, and Citicorp Center. The 110-story twin towers of the World Trade Center were also among New York's famous skyscrapers until they were destroyed in a terrorist attack in 2001.
Manhattan is the center of New York's cultural life. Numerous stage and motion picture theaters are located around Broadway in Midtown, which includes Times Square. The borough is the home of prominent music and dance organizations, such as the New York City Opera Company, the Metropolitan Opera Association, American Bailer Theatre, and the New York City Ballet.
In 1945, the United States Congress invited the United Nations to establish its permanent headquarters in the United States. Completed in 1952, the UN complex sits in Manhattan, alongside the East River, in the city of New York.
(33)
A. Three.
B. Four.
C. Five.
D. Six
虚拟存储管理系统的基础是程序的(12)原理,其基本含义是指程序执行时往往会不均匀地访问主存储器单元。根据这个原理,Denning提出了工作集理论。工作集是进程运行时被频繁地访问的页面集合。在进程运行时,如果它的工作集页面都在(13)内,能够使该进程有效地运行,否则会出现频繁的页面调入/调出现象。
A. 全局性
B. 局部性
C. 时间全局性
D. 空间全局性
在常见的软件生命周期中,适用于项目需求简单清楚,在项目初期就可以明确所有需求,不需要二次开发的软件生命周期模型是(48);适用于项目事先不能完整定义产品所有需求,计划多期开发的软件生命周期模型是(49)。
A. 瀑布模型
B. 迭代模型
C. 快速原型开发
D. 快速创新开发