问题 单项选择题

下面关于存储管理任务的叙述中,不正确的是______。

A.内存管理是给每个应用程序所必需的内存,而又不占用其他应用程序的内存

B.内存管理是管理硬盘和其他大容量存储设备中的文件

C.当某些内存不够用时,可以从硬盘的空闲空间生成虚拟内存以供使用

D.采取某些步骤以阻止应用程序访问不属于它的内存

答案

参考答案:B

解析:[知识点] 内存管理
[评析] 操作系统的存储管理功能是管理内存资源,主要实现内存的分配与回收、存储保护以及内存的扩充等。内存管理的目标是给每一个应用程序分配所必需的内存空间,而又不占用其他应用程序的内存。Windows和OS/2在内存管理方面做得很好,可以管理PC上安装的所有内存,当某些内存不够用时,则从硬盘的空闲空间生成虚拟内存以供使用。Windows和OS/2内存管理的另一个方面是采取某些步骤以阻止应用程序访问不属于它的内存。

选择题
单项选择题

In 1993, I published a book, The Rage of a Privileged Class, whose central thesis was that even the most gifted African-Americans assumed that they would never crash through America’s glass ceiling—no matter how talented, well educated, or hardworking they were. Few people of any race would claim that true equality has arrived; but so much has changed since Rage came out. Color is becoming less and less a burden; race is less and less an immovable barrier.

My new research explores how that phenomenon is changing the way people of all races view the American landscape. I polled two groups of especially accomplished people of color. One is the African-American alumni of Harvard Business School. The other is the alumni of A Better Chance, a program, founded in 1963, that sends ambitious, talented youngsters to some of the nation’s best secondary schools.

Generations, I concluded from my study, mattered deeply—with their defining characteristics rooted in America’s evolving racial dynamics. Generation 1, in this categorization, is the civil-rights generation—those (born before 1945) who participated in, or simply bore witness to, the defining 20th-century battle for racial equality. It is the generation of whites who, in large measure, saw blacks as alien beings and the generation of blacks who, for the most part, saw whites as irremediably prejudiced. Gen 2s (born between 1945 and 1969) were much less racially constrained—though they remained, in large measure, stuck in a tangle of racial stereotypes. Gen 3s (born between 1970 and 1995) saw race as less of a big deal. And that ability to see a person beyond color has cleared the way for a generation of Believers—blacks who fully accept that America means what it says when it promises to give them a shot.

That new reality made itself clear when I compared black Gen 1 Harvard M. B. A. s with their Gen 3 counterparts. Seventy-five percent of Gen 1s said blacks faced "a lot" of discrimination, compared with 49 percent of Gen 3s. Twenty-five percent of Gen 1s thought their educational attainments put them "on an equal professional footing with white peers or competitors with comparable educational credentials," compared with 62 percent of Gen 3s. Ninety-three percent of Gen 1s saw a glass ceiling at their current workplaces, compared with 46 percent of Gen 3s.

I am not about to make a statistical argument based on these numbers, but the message nonetheless seems clear. In the time since the Gen 1s came on the scene, a revolution has occurred. Those uptight suburbanites who couldn’t imagine socializing with, working for, or marrying a "Negro," who thought blacks existed in an altogether different dimension, who could no more see dining with a black person than dining with a giraffe, have slowly given way to a new generation that embraces—at least consciously—the concept of equality. Americans have, in some substantial way, re-created each other—to an extent that our predecessors might find astounding.

Which of the following is true about the three generations()

A. Generation 1s still live in a discriminatory environment

B. Generation 2s are classified into different racial types

C. Generation 3s think they can enjoy true racial equality

D. Generation 3s have better memories of their university life