Electronic books have changed the way many people read for   15 . Now online textbooks are changing the way some students learn and some teachers teach.

More than   16  students go to the public schools in Fairfax County, Virginia, outside Washington. Last year, the school system used digital books in fifteen schools. This school year, middle schools and high schools changed   17  printed to electronic textbooks in their social studies classes.

“I mean, it’s just   18  a regular textbook, except it’s got it all online.” says Luke Rosa, a history teacher at Falls Church High School.

Peter Noonan, an assistant superintendent(主管) of schools says, “The world’s changing   19 . And the online textbooks can change right along with the events that   20 .”

“Digital books also cost   21  than printed textbooks,” he says, “Usually it’s between fifty and seventy dollars   22  a textbook for each student, which adds up to about eight million dollars for all of our students in Fairfax County. In fact, we have bought all of the online textbooks for our students for just under six million dollars.”

Social studies teacher Michael Bambara says the e-book he uses in his government class is better than a(an)   23  textbook. It has materials for students   24  different levels of reading skills…

It was the last day of final examinations at a large college. On the steps of one building, a group of engineering students were discussing the exam that was ahout to begin. On their faces was confidence. This was their last exam before they graduated(毕业)and found jobs.
Some talked of jobs they already had，others of jobs they would get. With four years of college study，they felt ready and able to conquer(征服)the world.
The coming exam，they knew，would be easy. The professor(教授)had said they could bring any books or notes they wanted，but they couldn’t talk to each other during the test.
They walked into the classroom. The professor passed out the papers. The students’ smiles became wide as they saw that there were only five essay-type questions.
Three hours passed and the exam came to an end. Then the professor began to collect the papers. The students no longer looked confident. They seemed worried. No one spoke as the professor faced the class with the papers in her hand.
She looked at all the worried faces in front of her, and then asked，“How many students completed all five questions?”
Not a hand was put up.
‘‘How many of you answered four?” Still no hands.
“Three?Two?”The students moved restlessly in their seats.
“One，then. Certainly somebody finished one．”But the class stayed silent. The professor put down the papers.“That is just what I expected，”she said.
“I just wanted to make sure you realize that even though you have studied engineering for four years, there are still many things about the subject you don’t know. Instead of testing you on what you learned in this class, I’ve given you questions that skilled engineers face in the world outside the classroom. You can’t expect to be an expert(专家)on the day you graduate. You have to learn as you go.”
Then，smiling, she added，“You will all pass this course, but remember that your education has just begun.’’
【小题1】What does the underlined word“restlessly”mean in the passage?