题目内容：

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 still exist (存在).

According to the Inner Mongolia Morning Post. the tragedy (悲剧) occurred on the afternoon .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 nearthe 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 HaoLongbiao, also died of cold and exhaustion. 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 (祭莫仪式) 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.

1.The underlined word "occurred" here means"       ".

A. employed    B. mixed

C. happened    D. guided

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

A. skating on the ice    B. having a picnic

C. walking along the lake    D. taking photos at the lake

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

A. Hao Longbiao's body was found on December 14, 2002.

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

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

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

4.The author wrote the passage to       .

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

B. warn people of the danger of skating on ice

C. tell us a tragedy

D. advise university students to cherish(珍惜)their lives