To test the theory Witchel and his team invited 27 people and exposed them to a variety of digital content for three minutes at a time. The activities ranged from playing online games to reading documents like the EU banking regulations that most people would find boring. A video motion tracker monitored their movements as they powered through each assignment. Just as the researchers had suspected, the involuntary actions decreased surprisingly, by as much as 42%, when the subjects were totally absorbed in what they were reading or seeing.

　　Fortunately, the scientists are not planning to use the findings that were published in the online Journal to create machines that report students who are not focusing at school. Instead, they believe that combining the motion detecting technology into future computers will help enhance the digital learning experience.

　　The scientists say that being able to measure the student's interest level, will enable educators to adjust the materials real-time and re-engage the student. Witchel also believes that the technology can provide filmmakers with honest audience opinions and in the future, also be used in developing more understanding companion robots.

41. Dr. Harry Witchel wants future computers to have the competence to_______.

A. sense when users feel tired and less absorbed

B. record how long people surf on the Internet

C. help educators to prepare teaching materials

D. read the people's mind in front of a computer

42. What can we infer from the text?

A. The machine will be used to detect whether the students are focusing at school.

B. Subjects will make fewer unconscious movements if they are concentrated.

C. Future computers are intended to cure adolescents of their network addiction.

D. Most people think banking documents boring because they are of little value.

43. What may be the best title for the text?

　A. Being Exposed to Computers All Day Long Makes You Bored.

B. Scientists are Developing a More Advanced Computer Now.