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1)How many people are addicted to mobile phones?
Ответ в тексте: There are now over forty (40) million people in Britain with mobile phones... Значит
1. B
2)Moniles can be reason of...
Ответ в тексте: Some people even say that radiation from mobiles causes cancer. Означает
2.С
3) are among the biggest users of mobiles.
Teenagers are among the biggest users of mobils... Означает
3.С 
4) Is radiation one of causes of cancer?
4. Yes, radiation from mobiles causes cancer. 
5) In my opinion, texting was before mobile phones. People wrote letters.
6) I think if you use mobile phones for learning, it can improve your marks. But if you play games and don't work, then your marks will be worse.