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A
Until the 1980s, the American homeless population was made up of mainly older males. Today, homelessness strikes much younger part of the society. In fact, a 25-city survey by the US Conference of Mayors in 2013 found that families with children made up the fastest growing part of the homeless population. Many homeless children gather in inner cities； this changeable and frequently frightened student population creates additional problems—both legal and educational—for already overburdened urban school officials and teachers.
Estimates （估计） of the number of homeless Americans range from 350,000 to 3,000,000. Moreover, estimates of the number of homeless school children vary extremely. A US Department of Education report, based on state estimates, shows 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 he been cast （抛弃） 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 streets.
Federal law, the Stewart B. McKinney Homeless Assistance Act of 1987, included a section that pointed out the educational needs of homeless children. The educational provisions （条款） of the McKinney Act were based on the belief that all homeless children had the right to a free, good education.
1. The National Coalition for the homeless believes that the number of homeless children is about ___ .
A. 110,000B. 350,000
C. 440,000D. 1,500,000
2. Why is one part of the homeless population difficult to estimate?
A. The homeless children are too young.
B. The homeless population is growing rapidly.
C. Some homeless children stay outside school.
D. Some homeless children are cast away by their families.
3. The McKinney Act is mentioned in this passage in order to show that ___ .
A. the educational problems of homeless children are being recognized
B. the estimates on homeless children are hard to determine
C. the address of grade-school children should be located
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跟踪导练（五）
选词填空用方框里单词的正确形式填空，使其句意完整。每空一词，有两个词是多余的。trainexpertfrightenabandonrelax。
跟踪导练（三）
ARiding SchoolYou can start horse-riding at any age Choose private or。
跟踪导练（四）
AWhen humans and nature go head to head， nature often ends up losing R。
跟踪导练（二）
ADuring my high school years， the most important thing was what I was w。