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A classic series of experiments to determine the effects of overpopulation on communities of rats was conducted by a psychologist，John Calhoun．In each experiment，an equal number of male and female adult rats were placed in an enclosure（场地）．The rat populations were allowed to increase．Calhoun knew from experience approximately how many rats could live in the enclosures without experiencing stress due to overcrowding．He allowed the population to increase to approximately twice this number Then he fixed the population by removing the children that were not dependent on their mothers．At the end of the experiments，Calhoun was able to conclude that overcrowding causes a breakdown in the normal social relationships among rats，a kind of social disease．The rats in the experiments did not follow the same patterns of behavior as rats would in a community without overcrowding．
The females in the rat population were the most seriously affected by the high population density（密度）．For example，mothers sometimes deserted their children，and，without their mothers’care，the children died．The experiments showed that in overpopulated communities，mother rats do not behave normally．Their behavior may be considered diseased and pathological（病理学的）．
The leading males in the rat population were the least affected by over population．Each of these strong males claimed an area of the enclosure as his own．Therefore，these individuals did not experience the overcrowding in the same way as the other rats did．．However leading males did behave pathologically at times．Their antisocial（反社会）behavior consisted of attacks on weaker male，female，and immature rats．This unusual behavior showed that even though the leading males had enough living space，they too were affected by the general overcrowding．
Non-leading males in the experimental rat communities also exhibited unusual social behavior．Some withdrew（缩回） completely ,avoiding contact with other rats．Other non-leading males were too active，chasing other rats and fighting each other．
The behavior of the rat population has similarity in human behavior．People in densely（密） populated areas exhibit unusual behavior similar to that of the rats in Calhoun’s experiments．In large urban areas，such as New York City，London，and Cairo，there are deserted children．There are cruel，powerful individuals，both men and women．There are also people who withdraw and people who become too active．Is the major cause of these disorders（混乱）overpopulation?
Calhoun’s experiments suggest that it might be．In any case，social scientists and city planners have been influenced by the results of this series of experiments．
Which of the following inferences（推断）can NOT be made from the first paragraph?
A．Overpopulation causes pathological behavior in rat populations．
B．Calhoun had experimented with rats before．
C．Calhoun’s experiment is still considered important today
D．Stress does not occur in rat communities unless there is overcrowding．
The author implies that the behavior of the leading male rats is sometimes similar to that of
A．people who would like to keep to themselves
B．people who abandon their children
C．too active people
D．cruel，powerful people
The main point of this passage is that _______________．
A．although rats are affected by overcrowding，people are not
B．overcrowding may be an important cause of social pathology
C．the social behavior of rats is seriously affected by overcrowding
D．Calhoun's experiments have influenced many people
查看习题详情和答案>>A classic series of experiments to determine the effects of overpopulation on communities of rats was conducted by a psychologist，John Calhoun．In each experiment，an equal number of male and female adult rats were placed in an enclosure（场地）．The rat populations were allowed to increase．Calhoun knew from experience approximately how many rats could live in the enclosures without experiencing stress due to overcrowding．He allowed the population to increase to approximately 
twice this number Then he fixed the population by removing the children that were not dependent on their mothers．At the end of the experiments，Calhoun was able to conclude that overcrowding causes a breakdown in the normal social relationships among rats，a kind of social disease．The rats in the experiments did not follow the same patterns of behavior as rats would in a community without overcrowding．
The females in the rat population were the most seriously affected by the high population density（密度）．For example，mothers sometimes deserted their children，and，without their mothers’care，the children died．The experiments showed that in overpopulated communities，mother rats do not behave normally．Their behavior may be considered diseased and pathological（病理学的）．
T
he leading males in the rat population were the least affected by over population．Each of these strong males claimed an area of the enclosure as his own．Therefore，these individuals did not experience the overcrowding in the same way as the other rats did．．However leading males did behave pathologically at times．
Their antisocial（反社会）behavior consisted of attacks on weaker male，female，and immature rats．This unusual behavior showed tha
t even though the leading males had enough living space，they too were affected by the general overcrowding．
Non-leading males in the experimental rat communities also exhibited unusual social behavior．Some withdrew（缩回） completely ,avoiding contact with other rats．Other non-leading males were too active，chasing other rats and fighting each other．
The behavior of the rat population has similarity in human behavior．People in densely（密） populated areas exhibit unusual behavior similar to that of the rats in Calhoun’s experiments．In large urban areas，such as New York City，London，and Cairo，there are deserted children．There are cruel，powerful individuals，both men and women．There are also people who withdraw and people who become too active．Is the major cause of these disorders（混乱）overpopulation?
Calhoun’s experiments suggest that it might be．In any case，social scientists and city planners have been influenced by the results of this series of experiments．
【小题1】Which of the following inferences（推断）can NOT be made from the first paragraph?
| A．Overpopulation causes pathological behavior in rat populations． |
| B．Calhoun had experimented with rats before． |
| C．Calhoun’s experiment is still considered important today |
| D．Stress does not occur in rat communities unless there is overcrowding． |
| A．people who would like to keep to themselves |
| B．people who abandon their children |
| C．too active people |
| D．cruel，powerful people |
| A．although rats are affected by overcrowding，people are not |
| B．overcrowding may be an important cause of social pathology |
| C．the social behavior of rats is seriously affected by overcrowding |
| D．Calhoun's experiments have influenced many people |
A classic series of experiments to determine the effects of overpopulation on communities of rats was conducted by a psychologist，John Calhoun．In each experiment，an equal number of male and female adult rats were placed in an enclosure（场地）．The rat populations were allowed to increase．Calhoun knew from experience approximately how many rats could live in the enclosures without experiencing stress due to overcrowding．He allowed the population to increase to approximately twice this number Then he fixed the population by removing the children that were not dependent on their mothers．At the end of the experiments，Calhoun was able to conclude that overcrowding causes a breakdown in the normal social relationships among rats，a kind of social disease．The rats in the experiments did not follow the same patterns of behavior as rats would in a community without overcrowding．
The females in the rat population were the most seriously affected by the high population density（密度）．For example，mothers sometimes deserted their children，and，without their mothers’care，the children died．The experiments showed that in overpopulated communities，mother rats do not behave normally．Their behavior may be considered diseased and pathological（病理学的）．
The leading males in the rat population were the least affected by over population．Each of these strong males claimed an area of the enclosure as his own．Therefore，these individuals did not experience the overcrowding in the same way as the other rats did．．However leading males did behave pathologically at times． Their antisocial（反社会）behavior consisted of attacks on weaker male，female，and immature rats．This unusual behavior showed that even though the leading males had enough living space，they too were affected by the general overcrowding．
Non-leading males in the experimental rat communities also exhibited unusual social behavior．Some withdrew（缩回） completely ,avoiding contact with other rats．Other non-leading males were too active，chasing other rats and fighting each other．
The behavior of the rat population has similarity in human behavior．People in densely（密） populated areas exhibit unusual behavior similar to that of the rats in Calhoun’s experiments．In large urban areas，such as New York City，London，and Cairo，there are deserted children．There are cruel，powerful individuals，both men and women．There are also people who withdraw and people who become too active．Is the major cause of these disorders（混乱）overpopulation?
Calhoun’s experiments suggest that it might be．In any case，social scientists and city planners have been influenced by the results of this series of experiments．
1.Which of the following inferences（推断）can NOT be made from the first paragraph?[来源:Zxxk.Com]
A．Overpopulation causes pathological behavior in rat populations．
B．Calhoun had experimented with rats before．
C．Calhoun’s experiment is still considered important today
D．Stress does not occur in rat communities unless there is overcrowding．
2.The author implies that the behavior of the leading male rats is sometimes similar to that of
A．people who would like to keep to themselves
B．people who abandon their children
C．too active people
D．cruel，powerful people
3.The main point of this passage is that _______________．
A．although rats are affected by overcrowding，people are not
B．overcrowding may be an important cause of social pathology
C．the social behavior of rats is seriously affected by overcrowding
D．Calhoun's experiments have influenced many people
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A high school history teacher once told us, “If you make one close fried in school, you will be most fortunate. A true friend is someone who stays with you for life.” 36 teaches that he is right. Good friendship is just not easily 37 .
It is possible that we simply do not stay in one place long enough for a true friendship to 38 . However, there can be 39 disagreement in the need for each of us to think carefully about what kind of friendship we want.
To most of us, 40 are considered very important, but we need to make it clear in our minds what kind of friendship we want. Are they to be close or 41 at arm’s length? Do we want to 42 ourselves or do we want to walk on surface? For some people, many friendships on the surface are 43 enough and that’s all right. But at some point we need to make sure that our 44 are the same as our friends’ expectations. The sharing of 45 experiences including our tears as well as our dark dreams is the surest way to 46 friendships. But it must be undertaken（进行）slowly and 47 only if there are signs of interest and action 48 .
What are some of the 49 of friendship? The greatest is the attraction to expect too much too soon. Deep relationships 50 time. Another “major difficulty” is the selfishness to think one “ 51” the other, including his time and attention. 52 friendships require actions in return. In other words, you must give as 53 as you take. Finally, there is a question of taking care of. Unless you spend 54 time together, talking on the phone, writing letters, doing things together, friendships will die 55 .
36．A．Knowledge B．Books C．Teachers D．Experience
37．A．understood B．formed C. realized D．made
38．A．design B．intend C．develop D．appear
39．A．no B．any C．not D．some
40．A．lives B．relationships C．friendships D．classmates
41．A．taken B．left C．given D．kept
42．A．own B．share C．think D．suffer
43．A．than B．very C．quite D．so
44．A．expectations B．attractions C．options D．ideas
45．A．good B．ordinary C．social D．personal
46．A．prove B．produce C．weaken D．deepen
47．A．carried though B．carried out C．carried on D．carried away
48．A．by turns B．in return C．in turn D．in answer
49．A．difficulties B．differences C．disadvantages D．advantages
50．A．cost B．spend C. take D．waste
51．A．loves B．hates C．press D．possesses
52．A．differently B．Fortunately C．Similarly D．Regretfully
53．A．many B．much C．little D．possible
54．A．reasonable B．comfortable C．spare D．valuable
55．A．of B．from C．out D．away
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A classic series of experiments to determine the effects of overpopulation on communities of rats was conducted by a psychologist，John Calhoun．In each experiment，an equal number of male and female adult rats were placed in an enclosure（场地）．The rat populations were allowed to increase．Calhoun knew from experience approximately how many rats could live in the enclosures without experiencing stress due to overcrowding．He allowed the population to increase to approximately twice this number Then he fixed the population by removing the children that were not dependent on their mothers．At the end of the experiments，Calhoun was able to conclude that overcrowding causes a breakdown in the normal social relationships among rats，a kind of social disease．The rats in the experiments did not follow the same patterns of behavior as rats would in a community without overcrowding．
The females in the rat population were the most seriously affected by the high population density（密度）．For example，mothers sometimes deserted their children，and，without their mothers’care，the children died．The experiments showed that in overpopulated communities，mother rats do not behave normally．Their behavior may be considered diseased and pathological（病理学的）．
The leading males in the rat population were the least affected by over population．Each of these strong males claimed an area of the enclosure as his own．Therefore，these individuals did not experience the overcrowding in the same way as the other rats did．．However leading males did behave pathologically at times．Their antisocial（反社会）behavior consisted of attacks on weaker male，female，and immature rats．This unusual behavior showed that even though the leading males had enough living space，they too were affected by the general overcrowding．
Non-leading males in the experimental rat communities also exhibited unusual social behavior．Some withdrew（缩回） completely ,avoiding contact with other rats．Other non-leading males were too active，chasing other rats and fighting each other．
The behavior of the rat population has similarity in human behavior．People in densely（密） populated areas exhibit unusual behavior similar to that of the rats in Calhoun’s experiments．In large urban areas，such as New York City，London，and Cairo，there are deserted children．There are cruel，powerful individuals，both men and women．There are also people who withdraw and people who become too active．Is the major cause of these disorders（混乱）overpopulation?
Calhoun’s experiments suggest that it might be．In any case，social scientists and city planners have been influenced by the results of this series of experiments．
1.Which of the following inferences（推断）can NOT be made from the first paragraph?
A．Overpopulation causes pathological behavior in rat populations．
B．Calhoun had experimented with rats before．
C．Calhoun’s experiment is still considered important today
D．Stress does not occur in rat communities unless there is overcrowding．
2.The author implies that the behavior of the leading male rats is sometimes similar to that of
A．people who would like to keep to themselves
B．people who abandon their children
C．too active people
D．cruel，powerful people
3.The main point of this passage is that _______________．
A．although rats are affected by overcrowding，people are not
B．overcrowding may be an important cause of social pathology
C．the social behavior of rats is seriously affected by overcrowding
D．Calhoun's experiments have influenced many people
查看习题详情和答案>>