and save schools money. But the rolling backpack seems to have solved the weight problem, and the shocking costs to outfit every student with an e-reader, provide technical support and pay for regular software updates promise to make the e-textbook a very pricey choice.

　　As both a teacher who uses paper textbooks and a student of urban history, I can't help but wonder what parallels exist between my own field and this sudden, wholesale abandonment of the technology of paper.

4.Which of the following statements is TRUE according to the passage?

A. Multi-media websites and good old paper are kinds of digital-learning technologies.

B. Digital learning technologies will replace the paper textbooks sooner or later.

C. E-readers and multi-media websites are learning methods that are proved effective.

D. A tried-and-true technology is paper textbooks, long used in educational system.

5. What is the drawback of paper textbooks according to the passage?

A. Their weight. B. Their price. C. Their content. D. Their appearance.

6. What worries Maryanne Wolf is that ______________.

A. paper learning can provide more potential benefits

B. students may not focus on learning by digital reading

C. digital reading can't provide potential benefits for users

D. the results of digital reading effects are understandable

7.What is the author's attitude towards digital-learning?

　A. Disapproving. B. Supportive. C. Positive. D. Objective.

Rather than rolling your eyes when it's your turn to bow your head and give thanks, try being grateful. The result just might be good for you, from improving your feeling to your relationships. If you don't want to voice your gratitude, writing a letter may work, according to various studies by Steve Toepfer of Kent State University and his colleagues.

　　Toepfer and his colleagues had 219 students with an average age of 25 fill out questionnaires（问卷）to measure their happiness. They returned to the lab to fill out the survey three more times, with each visit about a week apart. Some of the students wrote a letter of gratitude each time they returned to the lab, while the control group didn't write about being thankful.

"The letter writers were instructed to write a letter of gratitude to anyone they wanted,