在数据库系统中,实现各种数据管理功能的核心软件称为【 】。

甘蔗茎内有一屡屡细丝，细丝属于（　　）

A．保护组织

B．营养组织

C．分生组织

D．输导组织

将抛物线y=（x-1）²+3向左平移1个单位，再向下平移3个单位后所得抛物线的解析式为（　　）

A．y=（x-2）²

B．y=（x-2）²+6

C．y=x²+6

D．y=x²

下列说法不正确的是（　　）

A．呼气时，膈肌舒张，膈顶部上升

B．吸气时，鼻子的功能是清洁湿润温暖空气

C．吸气时，外界大气压小于肺内气压

D．肺是主要的呼吸器官，气体交换的主要场所

会使离心泵电流降低的是（）。

A．排出压力增高

B．流量增加

C．转速增加

D．排出管破裂

With the possible exception of equal rights, perhaps the most controversial issue across the United States today is the death penalty. Many argue that it is an effective deterrent (威慑) to murder, while others maintain there is no convincing evidence that the death penalty reduces the number of murders.

The principal argument advanced by those opposed to the death penalty. basically, is that Lt is cruel and inhuman punishment, that it is the mark of a brutal society, and finally that it is of questionable effectiveness as a deterrent to crime anyway.

In our opinion, the death penalty is a necessary evil. Throughout recorded history there have always been those extreme individuals in every society who were capable of terribly violent crimes such-as murder. But some are more extreme than others.

For example, it is one thing to take the life of another in a fit of blind rage, but quite another to coldly plot and carry out the murder of one or more people in the style of a butcher. Thus, murder, like all other crimes, is a matter of relative degree. While it could be argued with some conviction that the criminal in the first instance should be merely isolated from society, such should not be the fate of the latter type murderer.

The value of the death penalty as a deterrent to crime may be open to debate. But the over whelming majority of citizens believe that the death penalty protects them. Their belief is reinforced by evidence which shows that the death penalty deters murder. For example, from 1954 to 1963, when the death penalty was consistently imposed in California, the murder rate remained between three and four murders for each 100000 population. Since 1964 the death penalty has been imposed only once, and the murder rate has risen to 10.4 murders for each 100000 population. The sharp climb in the state’s murder rate, which began when executions stopped, is no coincidence (巧合). It is convincing evidence that the death penalty does deter many murderers. If the bill reestablishing the death penalty is vetoed (否决), innocent people will be murdered— some whose lives may have been saved if the death penalty were in effect. This is literally a life or death matter. The lives of thousands of innocent people must be protected.

In the passage the author is primarily concerned with ().

A. supporting a position

B. describing an event

C. analyzing a problem objectively

D. settling a dispute