单项选择题
A. Internet communications. B. Classroom interactions. C. Cyber bullying. D. Instant messaging.
A. A college diploma. B. A high school diploma or GED. C. Two-year study experience. D. Two-year working experience.
A. Because he is lazy. B. Because he is not alone. C. Because he is too tired to communicate with others. D. Because he wants to keep a secret what he is doing.