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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.

第1题

Which of the following is an assumption on which the argument depends?

AIn 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.
BA sharp decrease in face-to-face social contact is the only change in daily activity that can lead to an increased incidence of depression.
CUsing the Internet presents no opportunities for people to increase the amount of face-to-face social contact they experienced in their daily lives.
DRegular 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.
EBefore 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.

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