地衣是藻类与真菌的共生体，藻类为真菌提供有机物，真菌为藻类提供水和无机盐。藻类和

设函数f(x)在开区间(a，b)内可导，证明：当导函数f’(x)在(a，b)内有界时，函数f(x)在(a，b)内也有界．

患者，男，56岁。突发右侧肢体无力并不能言语1月余来就诊，发病以来患者无吞咽困难，CT检查示"左侧大面积脑梗死"。失语症检查听理解、表达、复述、读理解、朗读、书写完全不能。

该患者语言功能的预后如何（）。

A.非常好，语言功能完全恢复正常

B.差，可通过简短的语言进行沟通

C.非常差，一般需通过代偿性技术进行沟通

D.好，语言功能基本上恢复正常

E.一般，可用语言进行日常交流

随着现代高层建筑的迅速发展，电梯已成为人们生活中必不可少的工具。当小明乘电梯匀速上升时，他的（   ）

A．动能减小

B．重力势能不变

C．机械能不断增大

D．机械能不变

下列推断正确的是

A．SiO₂是酸性氧化物，能与NaOH溶液反应

B．Na₂O、Na₂O₂组成元素相同，与CO₂反应产物也相同

C．CO、NO、NO₂都是大气污染物气体，在空气中都能温室存在

D．新制氯水显酸性，向其中滴加少量紫色石蕊试液，充分震荡后溶液显红色

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.

The author’s response to those who argue the death penalty for all degrees of murders would most likely be ().

A. supportive

B. hostile

C. negative

D. friendly