Do you like watching TV or playing games?How many hours do you use your phone a day?We call the time we spend on TV,computers and phones "screen （屏幕） time".
In a study（研究）,scientists （科学家） ask 577,000 children how much time they spend on screens,schoolwork and sports every day.They find about 68% of them spend more than 2 hours on screens.
Two hours of screen time a day is bad for children\’s health.The study shows harm（伤害）starts after 75 minutes of screen time for girls and 105 minutes for boys.Why is that? "Just because ▲ .In our study,24% of boys spend an hour a day doing sports,but only 14% of girls do that," Dr.Khan says.
So it is important for students to do sports and balance（平衡）their screen time.Tom has a "three-time system（系统） for his son Patrick—a "go time" for schoolwork,a "slow time" to play games or talk with friends on the Internet and a "green time" for sports. "We need to get children out and move.They can walk,ride a bike and play football,"he says.
（1）From the passage,we know 68% of the 577,000 children spend ______ on screens.
A．more than 2 hours
B．an hour
C．75 minutes
D．105 minutes
（2）Which of the following is the best for " ▲ " in Paragraph 3? ______
A．girls can do sports well
B．boys do not like sports
C．boys take more exercise
D．girls do more schoolwork
（3）The writer tells us that ______.
A．girls shouldn\’t spend time on screens
B．two hours of screen time is good for boys
C．it is important for students to do their schoolwork
D．children should do sports to balance their screen time