Scott Langteau has this message for kids：Spend less time playing video games.
It's a message that many a mom and dad has tried to impress upon many a youngster(and some notsoyoungsters)who spends perhaps a bit too much time with game controllers in hand.
But the 40yearold Langteau isn't a parent.He's experienced at video games－one who played producer on three “Medal of Honor” games and cofounded his own game development company.
Langteau has just published a children's book called“Sofa Boy”，which tells the story of a kid who spends too much time sitting on the couch with controllers held in hand and the rather dire consequences that follow.
It's a fairy tale picked straight from Langteau's own experiences as a lad with a fondness for video games and his painful struggle against game addiction.But first，Langteau would like make one thing clear：I'm not saying that you shouldn't play video games.I think video games are great.I think they do great things for kids.Instead，Langteau says his book is all about a little something called“moderation(克制)”．
“It's about being well rounded，”he says.“Just like with anything else，we all need to make sure that there's a variety in what we do.”
Video gamers can be rather badtempered when it comes to accepting criticism about their favorite entertainment.And understandably so.After all，most people who go around talking about the dangers of playing video games tend to be outsiders－people who don't play video games and certainly don't understand that they can be a valuable and healthy form of entertainment.
But Langteau and“Sofa Boy”seem to be in a unique position to deliver a message of gaming moderation that the young game masses might actually listen to.After all，this is a man who understands what it means to be a kid with a passion for games.His early experience has taught him a lesson.
小题1:Scott Langteau published “Sofa Boy” to ________.
A．share his great skills on games
B．warn kids against game addiction
C．tell about his fairy tale as a kid
D．deliver a message for games小题2:Which of the following is TRUE of the book“Sofa Boy”？
A．The book tells of the writer's own story.
B．The book describes an experienced gamer.
C．The boy in the book wins a medal for games.
D．The boy in the book is not an addict on games.小题3:．We can learn from the passage that ________.
A．Langteau advises the young to play games within limits
B．Langteau advises the young not to play games
C．playing video games ruins the future of kids
D．playing video games is of no benefit to kids小题4:．By saying “It's about being well rounded” Langteau thinks ________.
A．games do great things for kids
B．gamers are usually fat and round
C．games should be viewed from all sides
D．gamers are to blame for their behaviors
轴上传播，
、
是x轴上相距
m的两质点，
时，b点正好振动到最高点，而a点恰好经过平衡位置向上运动，已知这列波的频率为25Hz。