阅读理解。 Until the 1980s, the American homeless population comprised (组成) 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(负担过重的) 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 th e "throwaway" youths who have been cast of 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 stre ets. Federal law, the Stewart B. McKinney Homeless Assistance Act of 1987, includes a section that addresses the educational needs of homeless children. The educational p rovisions of the McKinney Act are based on the belief that all homeless children have the right to a free, appropriate education. 1. It is implied in the first paragraph that ____. A. the writer himself is homeless, even in his eightiesB. many older homeless residents are going on strike in 25 citiesC. there is a serious shortage of academic facilities (设施).D. homeless children are denied the opportunity of receiving free education 2. The National Coalition for the homeless believes that the number of homeless children is _____. A. 350,000B. 1,500,000C. 440,000D. 110 ,000 3. One part of the homeless population is difficult to estimate. The reason might well be ____. A. the homeless children are too young to be counted as childrenB. the homeless population is growing rapidlyC. the homeless children usually stay outside schoolD. some homeless children are deserted by their families 4. The McKinney Act is mentioned in this passage in order to show that ___. A. the educational problems of homeless children are being recognizedB. the estimates on homeless children are hard to determineC. the address of grade-school children should be locatedD. all homeless people are entitled(有权利的) to free education 5. The passage mainly deals with ____. A. the legal problems of the homeless childrenB. the educational problems of homeles s childrenC. the social status of older malesD. estimates on the homeless population