人口密度是单位面积土地上居住的人口数,它是表示世界各地人口的密集程度的指标。但人口密

题型:单项选择题

问题:

人口密度是单位面积土地上居住的人口数,它是表示世界各地人口的密集程度的指标。但人口密度只反映人口与土地面积的一般数量关系,不能体现单位面积土地上的人口成分,也不能体现人口与实际供养他的土地面积的关系。为了弥补这些缺陷,出现了一些新的补充性密度指标,如生理密度、农业密度等,而以面积计算的人口密度称为人口的数学密度。
这段文字意在说明()。

A.人口密度含义演变的原因

B.补充性密度指标的产生过程

C.人口密度的具体表现形式

D.土地面积和人口成分的关系

考点:地方公务员行政职业能力测试重庆市行政职业能力测验真题2010年4月
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设有一个已按各元素的值排好序的顺序表(长度大于2),现分别用顺序查找法和二分查找法查找与给定值k相等的元素,比较的次数分别是s和b,在查找不成功情况下s和b的关系是

A.s=b

B.s>b

C.s<b

D.s≥6

题型:单项选择题

静脉窦左角退化,其远段形成左房斜静脉的远部。

题型:单项选择题

阅读理解

     Researchers in the psychology department at the University of California at Los Angeles (UCLA)

have discovered a major difference in the way men and women respond to stress. This difference may

explain why men are more likely to suffer from stress-related disorders.

     Until now, psychological research has maintained that both men and women have the same

"fight-or-flight" reaction to stress. In other words, individuals either react with aggressive behavior, such

as verbal or physical conflict ("fight"), or they react by withdrawing from the stressful situation ("flight").

However, the UCLA research team found that men and women have quite different biological and

behavioral responses to stress. While men often react to stress in the fight-or-flight response, women

often have another kind of reaction which could be called "tend and befriend." That is, they often react

to stressful conditions by protecting and nurturing their young ("tend"), and by looking for social contact

and support from others - especially other females ('befriend").

     Scientists have long known that in the fight-or- flight reaction to stress, an important role is played by

certain hormones(激素) released by the body. The UCLA research team suggests that the female

tend-or-befriend response is also based on a hormone. This hormone, called oxytocin, has been studied

in the context of childbirth, but now it is being studied for its role in the response of both men and women

to stress. The principal investigator, Dr. Shelley E. Taylor, explained that "animals and people with high

levels of oxytocin are calmer, more relaxed, more  social, and less anxious." While men also secrete(分

泌)oxytocin, its effects are reduced by male hormones.

     In terms of everyday behavior, the UCLA study found that women are far more likely than men to

seek social contact when they are feeling stressed. They may phone relatives or friends, or ask directions

if they are lost.

     The study also showed how fathers and mothers responded differently when they came home to their

family after a stressful day at work. The typical father wanted to be left alone to enjoy some peace and

quiet. For a typical mother, coping with a bad day at work meant focusing her attention on her children

and their needs.

     The differences in responding to stress may explain the fact that women have lower frequency of

stress-related disorders such as high blood pressure or aggressive behavior. The tend-and-befriend

regulatory(调节的) system may protect women against stress, and this may explain why women on

average live longer than men.

1. The UCLA study shows that in response to stress, men are more likely than women to _____ .

A. turn to friends for help

B. solve a conflict calmly

C. find an escape from reality

D. seek comfort from children

2. Which of the following is true about oxytocin according to the passage?

A. Men have the same level of oxytocin as women do.

B. Oxytocin used to be studied in both men and women.

C. Both animals and people have high levels of oxytocin.

D. Oxytocin has more of an effect on women than on men.

3. What can be learned from the passage?

A. Male hormones help build up the body's resistance to stress.

B. In a family a mother cares more about children than a father does.

C. Biological differences lead to different behavioral responses to stress.

D. The UCLA study was designed to confirm previous research findings.

4. Which of the following might be the best title of the passage?

A. How men and women get over stress

B. How men and women suffer from stress

C. How researchers overcome stress problems

D. How researchers handle stress-related disorders

题型:单项选择题

下列关于国债表述正确的是()

A.国债是以国家信用为基础,有国家承担债务的一种财政收入形式;

B.国债的债权人可以是国内人也可以是国外人;

C.国债由于没有特别担保,所以具有较高风险;

D.国债都不可以上市自由买卖;

题型:单项选择题

三相功率的标幺值()一相功率的标幺值。

A.大于

B.小于

C.等于

D.大于等于

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