问题 单项选择题

与工程网络计划方法相比,横道图进度计划方法的缺点是不能()。

A、直观表示计划中工作的持续时间

B、确定实施计划所需要的资源数量

C、直观表示计划完成所需要的时间

D、确定计划中的关键工作和时差

答案

参考答案:D

解析:

横道图进度计划的缺点有:工序(工作)之间的逻辑关系可以设法表达,但不易表达清楚;适用于手工编制计划;没有通过严谨的进度计划时间参数计算,不能确定计划的关键工作、关键线路与时差;计划调整只能用手工方式进行,其工作量较大;难以适应大的进度计划系统。

选择题
阅读理解

阅读理解。

     Nowadays people are troubled by the violence that spreads throughout the media. Movies, television and

video games are full of gunplay and bloodshed, and one might reasonably ask what's wrong with a, society

that presents videos of violence as entertainment.

     Viewing large amounts of violent television and video games may well contribute to violent behavior in

certain individuals. The trouble comes when researchers downplay uncertainties in their studies or overstate

the case for causality (因果关系). Skeptics (怀疑论者) were dismayed several years ago when a group of

societies including, the American Medical Association tried to end the debate by issuing a joint statement,"

At this time, well over l,000 studies... point to a causal connection between media violence and aggressive

behaviors (攻击性行为) in some children."

     Freedom-of-speech advocates accused the societies of appealing to politicians, and even disputed the

number of studies (most were review articles and essays, they said). When Jonathan Freedman, a social

psychologist at the University of Toronto, reviewed the literature, he found only 200 0r so studies of television-

watching and aggression. And when he weeded out "the most doubtful measures of aggression", only 28%

supported a connection.

     The critical point here is causality. The alarmists say they have proved that violent media cause aggression.

But the assumptions behind their observations need to be examined. When labeling games as violent or non-

violent, should a hero eating a ghost really be counted as a violent event? And when experimenters record the

time it takes game players to read "aggressive" or "non-aggressive" words from a list, can we be sure what

they are actually measuring? The intention of the new Harvard Center on Media and Child Health to collect and

standardize studies of media violence in order to compare their methodologies, assumptions and conclusions

is an important step in the right direction.

     Another appropriate step would be to tone down the criticism until we know more. Several researchers

write, speak and testify quite a lot on the threat posed by violence in the media. That is, of course, their

privilege. But when doing so, they often come out with statements that the matter has now been settled,

drawing criticism from colleagues. In response, the alarmists accuse critics and news reporters of being

deceived by the entertainment industry. Such clashes help neither science nor society.

1. Why is there so much violence shown in movies, TV and video games?

A. There is a lot of violence in the real world today.

B. Something has gone wrong with today's society.

C. Many people are fond of gunplay and bloodshed.

D. Showing violence is thought to be entertaining.

2. What is the skeptics' view of media violence?

A. Violence on television is a fairly accurate reflection of real- world life.

B. A causal relationship exists between media and real-world violence.

C. Most studies overstate the effect of media violence on the viewers.

D. The influence of media violence on children has been underestimated.

3. The author uses the term "alarmists" to refer to those who _____.

A. use standardized measures in the studies of media violence

B. insist on a direct link between violent media and aggressive behavior

C. initiate the debate over the influence of violence media on reality

D. use appropriate methodology in examining aggressive behavior

4. What does the writer think of the debate concerning the relationship between the media and violence?

A. He more than agrees with the views held by the alarmists.

B. It should come to an end since the matter has now been settled.

C. The past studies in this field have proved to be misleading.

D. More studies should be conducted before conclusions are drawn.