根据短文内容回答短文后面的问题， 并把答案写在答题卡（纸）的相应位置。
At 5:05 pm on March 19, a loud alarm sounded around the playground of Tanghu Middle School, Sichuan. Students hurried to the playground with something covering their mouths. Don’t worry. There wasn’t a fire. Students were having a fire drill（演习）. School is a good place for students to study. Yet sometimes, it is easy to have accidents there.
A survey suggests that right safety training could prevent 80 percent of these accidents. In China, fire drills at school are common to teach students to deal with emergencies（紧急情况）. At the same time, many other countries have their own ways to keep children safe around school.
In Japan, public primary schools hold earthquake drills once a month. They teach students safety tips during an earthquake drill. The training teaches students to escape from earthquake-stricken areas without pushing and stampeding（踩踏）.
Most US school buildings have fire escapes on each floor. A fire escape has platforms with stairs and ladders. They are usually made of iron. Students can get to the fire escape through a fire exit door or a window.
In many middle schools in the UK, students can choose to take a bicycle course. There, they learn how to ride to school safely. Also, on roads without traffic lights near schools, there are crossing guards. They wear bright color clothes and stop cars to guide children across the road safely.
Did a fire really happen in Tanghu Middle School?
How often are earthquake drills held in public primary schools in Japan?
How do the students get to the fire escape in the US?
Who helps to guide children across the road safely in the UK?
How many countries are mentioned in the article?