Li Xiang, a junior 2 student, wishes he never got a mobile phone. Last week, he went to see a doctor because there was something wrong with his arms and fingers. The doctor told him that he had “mobile phone disease(疾病)”. Now, more and more teenagers are getting “mobile phone disease” __ 78__of using mobile phones.

Li Xiang got his mobile phone six months __79__. He __80__ messages to his friends with it all the time, even when going to bed. Li Xiang started to do badly in exams because he spent too much time __81__ mobile phone games. His mom felt very __82__ about him, but he didn’t stop playing with the mobile phone __83__ his arms got injured（受伤）.

Yang Ling, a doctor, says that if someone plays his mobile phone too __84__, like Li Xiang, he will get “mobile phone disease”. If teenagers find their arms or fingers hurt (疼痛), they should go to see a doctor as soon as __85__. Yang says teenagers should try to use their mobile phones less, especially at school.

Li Xiang, a junior 2 student, wishes he never got a mobile phone. Last week, he went to see a doctor because there was something wrong with his arms and fingers. The doctor told him that he had “mobile phone disease(疾病)”. Now, more and more teenagers are getting “mobile phone disease” __ 78__of using mobile phones.
Li Xiang got his mobile phone six months __79__. He __80__ messages to his friends with it all the time, even when going to bed. Li Xiang started to do badly in exams because he spent too much time __81__ mobile phone games. His mom felt very __82__ about him, but he didn’t stop playing with the mobile phone __83__ his arms got injured（受伤）.
Yang Ling, a doctor, says that if someone plays his mobile phone too __84__, like Li Xiang, he will get “mobile phone disease”. If teenagers find their arms or fingers hurt (疼痛), they should go to see a doctor as soon as __85__. Yang says teenagers should try to use their mobile phones less, especially at school.

Most of you know this mathematical game, of course. You and your friend draw crosses and circles on a sheet of paper. You do it one after another. The first pupil who gets three marks in a row wins. But do you know that you can play this game another way and it will become more interesting? You must try to make your friend win. If you get your three marks in a row, you don’t win — you lose!

It is more difficult to play this game the other way. The second pupil can always win (if he plays the right way), but he may not win if the first pupil begins with his mark in the center. Then if the first pupil always takes a place on the other side of his friend’s mark, nobody will win.
If your friend does not know the secret which we have explained, you must play each time so as to leave him the greatest number of ways to win. You may try a few games and you will see how interesting it is to play the game this way.
【小题1】 The passage tells us that it is _____ to play this game.