10.What is the topic of this passage?
11.According to the talk,what are the modern materials for building water storage tanks?
12.According to the talk,which of the following statements is true?Questions 13~15 are based on the following talk.
Extremely hot weather is common in many parts of the world.Although hotweather just makes most people hot,it can cause medical problems-and death.Floods,storms and other terrible natural events kill thousands of people every year.And,as expected,we hear much about them in news reports.We generally hear little,however,about what experts say may be nature's deadliest killer heat.
Health experts say that since the year nineteen-hundred,extremely hotweather has killed more people in the United States than any other natural event.One yearmthe unusually hot summer of 1980-heat caused about one-thousand seven-hundred deaths in the United States.In 1995,more than six-hundredpeople died in a similar heat wave in Chicago.
Experts say it is the total heat of a hot day or several hot days that can affecthealth.Several hot days are considered a heat wave.Experts say heat waves often become deadly when the nighttime temperature does not drop much from the highest daytime temperature.This causes intense stress on the human body.
Doctors say there are many things people can do to protect themselves fromthe dangers of extreme heat.They say to stay out of the sun,if possible.Drinkinga large amount of water or other beverages,wearing loose clothes made of light colored and natural materials can keep us from the danger caused by heat.Andwe should also learn the danger signs of the medical problems that are linked toheat.
13.How many people were killed in the heat wave in Chicago in 1995?
14.According to the experts,when do heat waves become deadly?
15.What should we do to protect ourselves from the dangers of extreme heat?