【正确答案】 B

【答案解析】[解析] 18-20
Today a powerful army of fire fighters stands ready to help whenever a fire breaks out. However, it is important for each person to know what to do at what moment.
The following rules may save your life: act quickly, but do not lose your head. The fire is hot, but you must stay cool. Thousands of lives would be saved every year if everyone had a plan of escape ready. Families should discuss escape plans. Each member should know just what he or she would have to do and practice it. Every home should have the fire department"s telephone number. Everyone should also know where the fire doors are. There should be a choice of escape routes, for fire may block one of them.
Fire goes wherever it can, but it usually follows the air coming into the house or the room. Opening doors will let in fresh air and cause a fire to run wild. That is why it is important to close the doors in a fire.
Fire needs air, and it also needs a certain high temperature in order to burn. That"s why water has been an important weapon against fire. Water not only cools the material but also cuts off the fire"s air supply.
18. What is vital if a fire breaks out?

【正确答案】 C

【答案解析】[解析]
Why should doors be closed in a fire?

【正确答案】 D

【答案解析】[解析]
What does the passage suggest?