twenty­five，' a doctor at Children's Hospital predicted．"可知， 医生预测作者会在二十五岁时失明；结合第四句 "No matter where I was or what I was doing, it was overhead like a dark cloud, just waiting for the right opportunity to destroy my world．"可知， 无论作者身在何处， 无论他在做什么， 它就像乌云一样在头顶盘旋， 仅仅等待着一个合适的机会来打破他的世界。据此可知， it指代"医生预测我会在二十五岁时失明"这件事， 故B项正确。A项意为"合适的机会"； C项意为"吃太多的糖"；D项意为"儿童医院"， 都与文意不符。

　　2．What happened when the author was about 25 years old?

　　A．He gave up painting.

　　B．He went blind completely.

　　C．He injured one of his eyes.

　　D．He picked up a new hobby.

　　C　解析：细节理解题。根据第三段第二句"Precisely three months after my twenty­fifth birthday, I had a massive hemorrhage(大出血) in my left eye because of an accident．"可知， 在作者二十五岁零三个月时， 左眼因事故而大出血， 故C项正确。

　　3．What brought a turning point to the author?

　　A．A special course.

　　B．A meaningful event.

　　C．An inspiring speech.

　　D．An important interview.

　　A　解析：细节理解题。根据第四段第一句"Desperate, I enrolled in(注册) a sixteen­week program for the blind and visually impaired(受损的)．"和最后一句"A whole new world opened up to me through this program．"可知， 作者参加了为盲人和视力受损的人服务的为期十六周的课程， 学会了使用电脑信息技术， 从此一个全新的世界展现在作者面前， 故A项正确。B项意为"一件有意义的事情"； C项意为"一场鼓舞人心的演讲"；D项意为"一次重要的采访"，均不符合文意。

　　4．What does the author intend to tell us?

　　A．No pain, no gain.

　　B．Every man has his price.

C．Nothing is impossible to a willing heart.