A、215,000.00 B、Less than 250,000. C、More than 350,000. D、About 300,000. D细节题。本文介绍美国家庭教育(home-schooling)这一文化现象。本题考的是数字，所以应在选项旁注明

In the United States many parents teach their children at home by themselves. The U. S. Department of Education estimates there are 250,000 to 350,000 home-schooled children in the country.
    The reasons of home-schooling vary widely. Children may be home-schooled because they are ill and cannot attend a normal school. Distance is the reason for children living on outback land or large farms. It may take hours to get to school and back home each day. Their parents think it inhumane to send their children to state boarding school. Some home schoolers think low of public school education which lacks of religious perspective. They want their children to learn not only traditional subject matter but strict religious teaching and a conservative political and social perspective. Other home-schoolers want to keep their children away from other children, because their family’ s faith or lifestyle is very different from that of those who attend the local school.
    There are, of course, some drawbacks of home-schooling. Social isolation is the major problem. Children are naturally social creatures and love to form friendship and learn in a group setting. Also, many home-schooled children may feel bored interacting with just their parents for many hours a day. And needless to say, not ail parents make good instructors.