A newspaper in Helsinki,Finland,recently published a cartoon of a baby with a mobile phone,telling his parents that his diaper(尿布) needed changing.But it's hardly a joke.Helsinki is home to Nokia,the mobilephone maker.It's one of the most “mobile”cities in the world.About 92 percent of its households have at least one mobile phone.And the kids start young. “A relatively normal age to get a mobile phone is now 7,”says Jan Virkki,marketing manager for a mobile phone company.Among the second graders at the Kulosaari Elementary School,the most popular object of desire this year is not a Barbie or a boy.It is a Nokia mobile phone with a picture of their own choice on the screen. “One of the first things we discuss when school starts is the rules for mobile phones,”says Tiia Korppi,a teacher.Among the rules:You have to put it away out of sight.You cannot turn it on.You cannot send text messages to your friends,or play amusing tunes(令人发笑的曲调)in class,or call your parents or call for a pizza during history. 1.The author uses the newspaper cartoon to show that ________ . A.he is good at telling jokes B.he cares much for children C.mobile phones are toys for newborn babies D.mobile phones are widely used in Finland 2.The passage is mainly about__________ A.different uses of mobile phones B.a successful mobilephone maker C.effect of mobile phones on children D.school rules for the use of mobile phones