Some experts say its pleasant but lazy summer break, which took hold in the early 20th century, is one of the reasons math skills and graduation rates of U.S. high schoolers ranked well below aver-age in two international education reports published in 2007. Others insist that with children under increasing pressure to devote their downtime to internships(实习)or study, there's still room for an institution that protects the lazy days of childhood. 1.What did the rural school calendar before the Civil War allow children to do? A.Enjoy a summer vacation. B.Take a break each quarter. C.Have 48 weeks of study a year. D.Assist their parents with farm work. 2.What did the educational reformers do in the 1840s? A.They introduced summer vacation. B.They shortened rural school terms. C.They promoted the study of farming. D.They advocated higher pay for teachers.