C. It can send a weekly report to their parents.

　D. It can help the students to set proper goal.

2. What can we learn about Math Alarm?

　A. Without a Math Alarm, you'll be late for schoo1.

　B. You can set your alarm by answering a math problem.

　C. You have to solve a math problem before turning it off.

　D. It can help you solve complex math problems.

3. What's the disadvantage of the Cliff Notes Study Guide app?

　A. It only covers three famous books.

　B. It is forbidden to use by the teachers.

　C. It charges too much for each novel.

　D. It only contains those contemporary well-known novels.

　　Last week, Education Secretary Arne Duncan declared war on paper textbooks. "Over the next few years," he said in a speech at the National Press Club, "textbooks should be abandoned." In their place would come a variety of digital-learning technologies, like e-readers and multi-media websites.

　　Such technologies certainly have their place. But Secretary Duncan is threatening to light a fire to a tried-and-true technology-good old paper-that has been the foundation for one of the great educational systems on the planet. And while e-readers and multi-media websites may seem appealing, the idea of replacing an effective learning platform with a widely hyped (炒作) but still unproven one is extremely dangerous.

　　An expert on reading, Maryanne Wolf, has recently begun studying the effects of digital reading on learning, and so far the results are mixed. She worries that Internet reading, in particular, could be such a source of distractions(分散注意力) for students that they may cancel out most other potential benefits of a Web-linked, e-learning environment and while it's true that the high-tech industry has sponsored substantial amounts of research on the potential benefits of Web-based learning, not enough time has passed for longitudinal(纵向的) studies to demonstrate the full effects.

In addition, digital-reading advocates claim that lightweight e-books benefit students' backs