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问题 单项选择题

现实世界中的每一个事物都是一个对象，任何对象都有自己的属性和方法。对属性的正确叙述是______。

A．属性就是对象所具有的固有方法

B．属性只是对象所具有的内部特征

C．属性只是对象所具有的外部特征

D．属性就是对象所具有的固有特征，一般用各种类型的数据来表示

答案

参考答案：D

解析： 任何对象都有自己的属性和方法。属性就是对象所具有的固有特征。对象的属性一般用各种类型的数据来表示，对象的方法就是对象可以执行的动作或它的行为。

单项选择题

在公钥加密机制中，公开的是______。

A．明文

B．加密密钥

C．解密密钥

D．加密密钥和解密密钥
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单项选择题

True, some of the attacks against whites by blacks are for money and valuables. But, others ale revenge assaults by blacks for a real or imagined racial insult. It is equally true that the vast majority of violent crimes against whites are committed by whites, while the vast majority of violent crimes against blacks are committed by other blacks. Yet even after discounting crimes that are hastily and erroneously (错误地，不正确地) tagged as racially motivated, many blacks do attack whites because they all white. A 1998 Justice Department study confirmed that nearly 20% of the more than 4,000 hate crimes well committed against whites, and their attackers were blacks. The Southern Poverty Law Center also notes that there is a huge escalation in black-on- white violence from nearly none at the beginning of the 1990s.
A collection of white supermacists and rightist extremist groups have eagerly made black-on- white violence a wedge issue in their movement to paint blacks as the prime racial hate mongers in America. The New Century Foundation, an ultra-conservative think-tank, has launched a full- blown national campaign to alert whites to the danger of black hate crimes. These groups and individuals magnify hate crimes by blacks in order to back their social agenda. They oppose affirmative action programs and per hate crime laws. They downplay, or justify, the proliferation of white-supremacist-tinged paramilitary groups, police violence, and racial profiling. And they lobby hard for more prisons, police, and tougher laws.
Black-on-white violence also reinforces white fears of blacks as the ultimate menace to society. When blacks say or do nothing about these attacks, it is taken by some as a tacit signal that blacks put less value on white lives than black lives. This is a terrible price for black silence on hate crimes committed by blacks.

What can be inferred according to this passage

A. Some crimes are racially motivated.
B. All black people hate white people.
C. There’s racial discrimination only in America.
D. America is not a good place for immigrants for its serious black-on-white violence.
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