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When many people are worried that there are no more heroes in the modern era，two university students who lost their

lives to rescue drowning children have shown that heroes still 

exist. According to the Inner Mongolia Morning Post, the tragedy (悲剧）occurred on the afternoon of

 December 14,2002 when three school students skating on a frozen lake in Qingcheng Park in Hohhot 

fell through the ice into the freezing water．  

More than 20 university students who happened to be near the spot immediately went to the rescue of

the children. Two children were quickly rescued but the third died. The child’s body was not found for

three hours. Two of the rescuers，Liu Ye and Hao Longbiao，also died of cold and exhaustion（筋疲力尽）.The body of Hao who

took the lead in jumping into the lake was not found until the next day．A 

student who was unwilling to tell his name said he and his classmates from the local college were taking photos at the lake．

When they heard the children's cries for help， they went to the ice hole hand in 

hand to rescue the children． But the ice kept breaking， causing most of them to fall into the icy water．

Local residents held mourning ceremonies（祭奠仪式） at the lake．

Eight of the students were seriously affected by the freezing water and were being kept in hospital

for further observation， but their lives were no longer in danger．

49. When the three students fell into water，the university students were              

50. Which of the following is TRUE according to the passage？    

51. It can be inferred that         ．  

52. The author wrote the passage to        ​．