[单项选择]Too much screen time is bad for kids. Children who watch TV or play computer games for 2 hours or more a day are more likely to have poor (67) , behave badly and have difficulties (68) to other people—even if they are (69) active.
Previous research has suggested that young children who use a lot of screen-based entertainment (70) developing difficulties with communication and concentration, as well as other (71) problems and obesity (肥胖). However, it has not been clear (72) these effects are caused by the (73) of physical exercise, long periods sitting (74) or by gaming and TV themselves.
Children who watched TV for an (75) of 2 hours or more per day were 61 per cent more likely to have emotional, (76) and concentration problems, (77) using a standard test of children’s psychological well-being. The (78) figure for 2 hours or more of computer-based entertainment— (79