问题 选择题

美国著名科技期刊《探索》2007年1月号将超级电容器列为2006年世界七大技术发现之一,认为超级电容器是能量储存领域的一项革命性发展,并将在某些领域取代传统电池.作为一种新型储能装置,由于其单体电容可以是普通电容的百万倍以上,具有超级储电能力、高度可逆、寿命长等特点,几乎可无限次反复充放电,允许很大的充放电流、很宽的电压和温度范围,如图是某个超级电容器的照片.由于没有学过有关超级电容器的更多知识,某同学凭上述了解,提出了以下几点猜测,你认为这些猜测中最不合理的是(  )

A.可能由于其某种结构特征,极大地增加了两个电极面积

B.超级电容器两电极间距离较普通电容器要小

C.由于超级电容器几乎可无限次反复地充放电,寿命长,所以对环境污染相对较少

D.可储存电荷量非常大,所以充电时间一定非常长,并因此影响其推广应用

答案

A、超级电容器电容大,根据电容的决定式C=

ɛS
4πkd
,可知两个电极面积大,这个猜想是合理的,故A错误.

B、超级电容器电容大,根据电容的决定式C=

ɛS
4πkd
,可知超级电容器两电极间距离较普通电容器要小,这个猜想是合理的,故B错误.

C、超级电容器可无限次反复地充放电,寿命长,对环境污染相对较少,这个猜想是合理的,故C错误.

D、超级电容器储存电荷量非常大,但据题知充电电流大,充电时间并不是非常长,所以这个猜想是不合理的,故D正确.

故选:D

阅读理解

In some urban centers, workholism is so common that people do not consider it unusual: they accept the lifestyle as normal. Government workers in Washington D. C., for example, frequently work sixty to seventy hours a week. They don’t do this because they have to; they do it because they want to.

Workholism can be a serious problem. Because true workaholics (工作狂) would rather work than do anything else, they probably don’t know how to relax.

Is workholism always dangerous? Perhaps not. There are, certainly, people who work well under stress. Some studies show that many workaholics have great energy and interest in life. Their work is so pleasurable that they are actually very happy. For most workaholics, work and entertainment keep them busy and creative.

Why do workaholics enjoy their jobs so much? There are several advantages to work. Of course, it provides people with paychecks, and this is important. But it offers more than financial security. It provides people with self-confidence; they have a feeling of satisfaction when they’ve produced a challenging piece of work and are able to say, “I made that.” Psychologists claim that work gives people an identity through participation in work, they get a sense of self and individualism. In addition, most jobs provide people with a socially acceptable way to meet others. Perhaps some people are compulsive about their work, but their addiction seems to be a safe-even an advantageous-one.

小题1:The passage indicates that workaholics ______.

A.just know work but nothing else

B.are willing to work hard for long hours without pay

C.find their work provide them more satisfaction and self-confidence than how much they are paid

D.has the work with more responsibility than others小题2:One of the reasons that some people are not willing to quit their jobs even in their eighties and nineties is that ______.

A. they are in the need of financial security

B. they would rather work than be disturbed by domestic affairs

C. they long for a sense of identity and being accomplished

C. they may have health problems from sheer boresom

小题3:This passage is mainly about ______.

A.workaholics are usually successful people, but their lives are in a mess

B.workholism can lead to serious problems but it can also create a joyful life

C.people who are absorbed in their work may enjoy movies, sports and other kinds of entertainment

D.those who work even under difficult conditions may be very happy小题4:It can be inferred from the passage that ______.

A.in the eyes of all the common people workaholics are peculiar

B.to workaholics, work is the sole source of happiness

C.a piece of challenging work may provide the workaholics a sense of satisfaction

D.workaholics are as addicted to their job as other people are to drugs or alcohol

单项选择题