单项选择题
A. It is easy for a teacher to intervene. B. It is difficult to detect. C. It is impossible to monitor. D. It occurs without your knowledge.
A. E-mail messages. B. Cell phone messages. C. Postings on websites. D. Online diaries.
A. Those who wish to continue their education with a bachelor’s degree. B. Those who wish to receive one aspect of education. C. Those who wish to obtain general classes for their current jobs. D. Those who wish to get specific skills for their current careers.