阅读理解。
People know the danger of fires. It's good for a family to learn how to prepare for a fire. Here are some
suggestions:
Put a smoke alarm in the house. Smoke from a fire causes the alarm to go off. The alarm makes a loud
sound. The sound tells everyone to leave the house at once.
Make escape (逃脱) plans. They should know all the ways out of the house. If there is a fire, everyone
follows the plan to get out. Part of the plan is to check all the windows to make sure they can be opened
easily.
Buy fire extinguishers (灭火器) in the house. Everyone in the family should know how to use them.
Practice for a fire. They do fire practice because they teach children about fire safety. Everyone in the
family should know the following fire rules:
＊Don't open a hot door! The fire can grow more quickly if you open the door.
＊Stay close to the floor! Smoke can be more dangerous than fire; the best air is near the floor because
smoke rises.
＊What will you do if you hair or clothes start to burn? First, stop! Don't run! The fire burns faster
because of more air. Drop! Fall to the floor. They roll! Turning over and over will make the fire go out. Put
a blanket (毯子) around you to keep air away from the fire that may still be on you.
There are many possible causes for firs. A wise family is ready all the time. If there is a fire, don't forget
to call 119 for help.
1. What does it mean when a smoke alarm rings at home?
A. You have to get up.
B. Water is running to the floor.
C. Something is burning.
D. Someone breaks your window.
2. The writer advices people to do the following to prepare for a fire except that _______.
A. they practice for a fire
B. they make escape plans
C. they buy fire extinguishers
D. they use electrical cookers
3. When a fire happens, _______ if you open the hot door.
A. the fire will grow more quickly
B. the electricity will be cut off
C. the door will soon be on fire
D. the house will fall down
4. What are the right steps you should take when your hair or clothes catch fire?
A. Stop, run, roll.
B. Stop, drop, roll.
C. Run, drop, roll.
D. Roll, drop, stop.
5. What is the best title for this passage?
A. The Dangers of a Fire.
B. The Cause of a Fire.
C. Learn to Use a Fire Extinguisher.
D. Be Ready for a Fire.
，P（AB）=P（AC）=0，
，则P（A∪B∪C）=（）。