单项选择题
A. maintain balance and improve coordination. B. protect brain cells from damage. C. increase the brain’s memory storage capacity. D. keep brain alert.
A. explore special interests. B. interact with other students. C. improve leadership skills. D. do scientific researches.
A. The envy incidents triggered by Facebook. B. Psychological distress and social comparison. C. Mental health of internet users. D. The passive use of Facebook.