Electronic books have changed the way many people read for pleasure. Now online textbooks are changing the way some students¡¡1  and some teachers teach.

More than 175£¬000 students¡¡2  the public schools in Fairfax County, Virginia, outside Washington. Last year, the school system used digital¡¡3  in fifteen schools. This school year, middle schools and high schools changed from¡¡4  to electronic textbooks in their social studies classes.