[单项选择]

The Internet use appears to cause a loss in psychological (36) , (37) a research (38) the Carnegie Mellon University.
(39) people who spent just (40) hours a week on the Internet experienced more depression(沮丧) and loneliness (41) those who spend less time on the Net, the (42) study showed. And it wasn’t (43) people who were already feeling bad spent more time on the Internet, but that using the Net actually appeared to cause the bad feelings.
Researchers are (44) at the results, (45) were completely (46) to their views. They expected that the Net would prove socially (47) than television, since the Net allows users to choose their information and to communicate with others.
The fact (48) the Internet use reduces time available for family and friends may (49) for the drop in well-being. Faceless, bodiless communication may be le
A. what 
B. when 
C. where 
D. how

The Internet use appears to cause a loss in psychological (36) , (37) a research (38) the Carnegie Mellon University.
(39) people who spent just (40) hours a week on the Internet experienced more depression(沮丧) and loneliness (41) those who spend less time on the Net, the (42) study showed. And it wasn’t (43) people who were already feeling bad spent more time on the Internet, but that using the Net actually appeared to cause the bad feelings.
Researchers are (44) at the results, (45) were completely (46) to their views. They expected that the Net would prove socially (47) than television, since the Net allows users to choose their information and to communicate with others.
The fact (48) the Internet use reduces time available for family and friends may (49) for the drop in well-being. Faceless, bodiless communication may be le
A. good-being 
B. well-being 
C. better-being 
D. best-being