Until the 1980s, the American homeless population comprised mainly older males. Today homelessness strikes much younger part of society. In fact, a 25-city survey by the U. S. Conference of Mayors in 1987 found that families with children make up the fastest growing part of the homeless population. Many homeless children gather in inner cities; this transient (变化无常的) and frequently frightened student population creates additional problems—both legal and educational—for already overburdened urban school administrators and teachers.
　　Estimates of the number of homeless Americans range from 350, 000 to three million. Likewise, estimates of the number of homeless school children vary radically. A U. S. Department of Education report, based on state estimates, states that there are 220,000 homeless school-age children, about a third of whom do not attend school on a regular basis. But the National Coalition for the Homeless estimates that there are at least two times as many homeless children, and that less than half of them attend school regularly.
　　One part of the homeless population that is particularly difficult to count consists of the "throwaway" youths who have been cast off their homes. The Elementary School Center in New York City estimates that there are 1. 5 million of them, many of whom are not counted as children because they do not stay in family shelters and tend to live by themselves on the streets.
　　Federal law, the Stewart B. McKinney Homeless Assistance Act of 1987, includes a section that addresses the educational needs of homeless children. The educational provisions of the McKinney Act are based on the belief that all homeless children have the right to a free, appropriate education.

　　21.   In 1987, the American homeless population was made up of______.
　　A. older males                                         B.  school children
　　C.  adults                                                 D.  both A and B

　　22.   The author implies in the first paragraph that______.
　　A.   the homeless population is growing rapidly
　　B.   there is a serious shortage of school administrators and teachers
　　C.   homeless children often move from place to place
　　D.   homeless children usually stay outside schools

　　23.   The National Coalition for the Homeless estimates that there are______homeless
　　children.
　　A.  700,000                                            B.  350,000
　　C.  440,000                                            D.  70,000

　　24.   One part of the homeless population is difficult to count.   The reason might be that
　　A.   homeless children live on the streets
　　B.   homeless children have no parents
　　C.   the homeless are too young to be counted as children
　　D.   homeless children are not taken as members of their families

　　25.   The aim of the McKinney Act is to_______.
　　A.   offer education for homeless children
　　B.   provide family shelters for homeless children
　　C.   reduce the number of homeless children
　　D.   estimate the number of homeless population

　　答案： 21. D   22. B    23. C,  24. D   25. A