A decrease in face-to-face social contact can precipitate depression. Time spent using the Internet cannot be spent in face-to-face social contact, so psychologists have speculated that sharply increasing Internet use can cause depression. Studies of regular Internet users have found a significantly higher incidence of depression among those who had recently doubled the amount of time they spent using the Internet than among those whose use had not increased. Hence, the psychologists’ speculation is correct.
1. Which of the following is an assumption on which the argument depends?
A. In general, the reason that the people in the studies had doubled their Internet use was not that they had earlier experienced a significant decrease in opportunities for face-to-face social contract.
B. A sharp decrease in face-to-face social contact is the only change in daily activity that can lead to an increased incidence of depression.
C. Using the Internet presents no opportunities for people to increase the amount of face-to-face social contact they experienced in their daily lives.
D. Regular Internet users who are depressed will experience an immediate improvement in mood if they sharply decrease the amount of time they spend on the Internet.
E. Before they doubled the time they spent on the Internet, the people who did so were already more prone to depression than are regular Internet users in general.
文章中心结论是中间这句：so psychologists have speculated that sharply increasing Internet use can cause depression 增加上网时间会引起抑郁。