阅读理解。 Dear Mr. Know, My 13-year-old son was in an accident several days ago. His doctors say he has no chance of seeing again. I have no experience with the blind (盲的). I want to know how he may behave in the future. I want to know everything I can to help him. Please help! Mary Dear Mary, My son, Trey, who is nine years old, also lost his vision (视力) suddenly. I think one of the most important things for you to  do  is  to find other blind kids of    your son's   age in your area.    He will   need someone   to talk   to   that understands his situation and can give him some advice. Sometimes, other kids treat your son differently, and it takes time, experience, and patience to learn the best ways of dealing with this. But if your son had another successful, blind teenager to talk to, that person could tell him how they dealt with the same situations. Also, often talk to the doctor so that they can show your son how to get around safely.   Learning to use assistant technology (辅助技术) and Braille (盲人用的点字法) are also extremely important. Where I live, we have a place called Envision that offers these services. Check around for something similar in your area. I hope I have been of some help. Jack 1. How old is Mary's son? A. 9. B. 10. C. 12. D. 13. 2. Mary is worried about ________. A. why her son will be blind B. how to help her son C. that her son won't be allowed to go to school D. how to help the blind in her neighborhood 3. Jack is _______. A. a doctor B. a blind C. Mary's son D. Trey's father 4. How many pieces of advice does Jack give to Mary? A. One. B. Two. C. Three. D. Four. 5. If you go to Envision, you can ______. A. look for blind friends B. find many blind children C. learn to use assistant technology and Braille D. get the advice from the doctors