阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。
Each new
school year brings fresh reminders of what educators call the summer learning
gap. Some call it the summer learning setback. Simply speaking, it means the
longer kids are out of school, the more they forget. The only thing they might
gain is weight.
Most American
schools follow a traditional nine-month calendar. Students get winter and
spring breaks and about ten weeks of summer vacation. Some schools follow a
year-round calendar. They hold classes for about e ight weeks at a time, with a few weeks off in between. The National Association for Year-Round Education says there were fewer than three thousand such schools at last count. They were spread among forty-six of the fifty states.
But many experts point out that the number of class days in a year-round school is generally the same as in a traditional school. Lead researcher Paul von Hippel said, “Year-round schools don't really solve the problem of the summer learning setback. They simply spread it out across the year.”
Across the country, research shows that students from poor families fall farther behind over the summer than other students. Experts say this can be prevented. They note that many schools and local governments offer programs that can help.
But calling them “summer school” could be a problem. The director of the summer learning center at Johns Hopkins, Ron Fairchild, said research with groups of different parents in Chicago and Baltimore found that almost all strongly disliked the term “summer school”. In American culture, the idea of summer vacation is connected to beliefs about freedom and the joys of childhood. The parents welcomed other terms like “summer camp”, “enrichment”, “extra time” and “hands-on learning”.
