72.Why is David so different from other young people of his age?

　　He lives at home with his parents.　

　　He has got a job.　

　　He earns an extremely high payment.　

　　He does not go out much.　

 73.David's greatest problem is that 　　.

　　he doesn't know what to buy with the money　

　　he can't make as many games as he wishes　

　　he can't be treated as an adult (成年人) by the bank　

　　he had learnt to use computers at school　

 74.He left school after taking six O-levels because 　　.

　　he wanted to work on computers　

　　he was afraid that the market might disappear　

　　he did not enjoy school at all　

　　he wanted to become a millionaire (百万富翁) and retire early　

 75.Why does David think he might retire early?

　　He thinks his company might close down.　

　　He wants to stop working when he is a millionaire (百万富翁).　

　　One has to be young to write computer programs.　

　　He thinks computer games might not always sell so well.