When many people are worried that there are no more heroes in the modern times，two university students who lost their lives to rescue drowning children have shown that heroes are still living in the world．
According to the Inner Mongolia Morning Post，the tragedy（悲剧） occurred on the afternoon of December 14,2010 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 place 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 was the first to jump 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 people 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．
The underlined word “occurred” here means“____”．

A．employed

B．mixed

C．guided

D．happened

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

A．skating on the ice	B．taking photos at the lake
C．having a picnic	D．walking along the lake

Which of the following is TRUE according to the passage？

A．Three students died on the same day in all．

B．Hao Longbiao’s body was found on December 14,2010．

C．The university students didn’t think it dangerous to save the drowning children in the lake．

D．Local people were not brave in face of danger．

It can be inferred that ＿＿＿＿．

A．people think little of the two university students' death

B．the ice on the lake wasn't strong enough to skate on

C．some students regretted for what they had done

D．heroes don't agree with the steps of modern times

The author wrote the passage to ＿＿＿＿．

A．warn people of the danger of skating on ice

B．call on people to learn from the brave university students

C．tell us a tragedy

D．advise university students to love their lives