[单项选择]

As America’s prison population has exploded, hard-pressed officials have relied on private prisons to house about 5 percent of the nation’s 1.7 million prisoners. But a number of recent incidents have strengthened accusations that for-profit prisons do not always measure up on security and reliability. A judge ordered a Youngstown, Ohio, prison for criminals from Washington, D. C. to remove violent prisoners after 13 stabbings(刺伤案), two of them fatal. Colorado closed a center for teen lawbreakers after a suicide and evidence that prisoners had been abused. Tennessee legislators have now put on hold a plan to privatize most of that state’s prison system.
Last week, the American Federation of State, County and Municipal Employees issued a report charging that private prisons save taxpayers little money and are full of waste and deception (欺骗). The union accused some firms of persuading public officials for profitable contracts and then running substandard
A. they are cheating the public
B. they are not saving money
C. the facilities are not as standard as they claim to be
D. there should be more private prisons

[单项选择]

As America’s prison population has exploded, hard-pressed officials have relied on private prisons to house about 5 percent of the nation’s 1.7 million prisoners. But a number of recent incidents have strengthened accusations that for-profit prisons do not always measure up on security and reliability. A judge ordered a Youngstown, Ohio, prison for criminals from Washington, D. C. to remove violent prisoners after 13 stabbings(刺伤案), two of them fatal. Colorado closed a center for teen lawbreakers after a suicide and evidence that prisoners had been abused. Tennessee legislators have now put on hold a plan to privatize most of that state’s prison system.
Last week, the American Federation of State, County and Municipal Employees issued a report charging that private prisons save taxpayers little money and are full of waste and deception (欺骗). The union accused some firms of persuading public officials for profitable contracts and then running substandard
A. There are not enough public prisons.
B. Private prisons are for making money.
C. Private prisons are not as good as public prisons.
D. 5% of the prisoners in the US now live in private prisons.

[简答题]
1 Population ecology is the science that measures changes in population size and composition and identifies the causes of these fluctuations．Population ecology is not concerned solely with the human population．In ecological terms．a population consists of the individuals of one species that simultaneously occupy the same general area．rely on the same resources, and are affected by similar environmental factors．The characteristics of a population are shaped by its size and by the interactions among individuals and between individuals and their environment．
2 Population size is a balance between factors that increase numbers and factors that decrease numbers．Some factors that increase populations are favorable light and temperature，adequate food supply, suitable habitat, ability to compete for resources, and ability to adapt to environmental change．Factors that decrease populations are insufficient or excess

[单项选择]Until recently, most population growth has occurred in relatively dense urban environments. In (31) words, even if we were witnessing rapid population growth, that would not mean that the (32) were filling in with people. (33) , the urban areas would tend to become more crowded. Historically, we find that people have moved to (34) the jobs were. Jobs were usually in ports or locations with many natural (35) . After transportation became relatively cheap, other geographical locations became (36) of economic activity. One factor that determines where people will move to, even when transportation becomes cheap, is (37) . And individuals working in cities (38) higher incomes than those working in (39) areas. Hence, population has tended until the 1970s to (40) in our major urban centers.
Recently population has (41) out of the Northeast to the South and to the West for the more pleasant climates. If people di
A. withdraw
B. derive
C. develop
D. benefit