A、Serious burns. B、Great panic. C、Smoke and gases. D、Careless mistakes. C短文提到，在家庭火灾中，许多死亡是由烧伤和恐慌造成的，但大部分(most)的死亡却是因为致命的浓烟和毒气，句中

Many deaths from home fires are the result of burns and panic, but most are caused by deadly smoke and gases. These fatal fires are often caused by such careless acts as throwing away a lighted match or cigarette, allowing rubbish to pile up, overloading electrical wires, or misuse of heating and cooking equipment.
    Few families go to bed at night without first checking to make sure that the doors and windows are locked, but they overlook a very basic fire safety rule. This rule states that people should sleep with their bedroom doors closed. Nighttime fires are most serious because the family is asleep and the discovery of fire is usually too late. A closed bedroom door gives extra protection by delaying the gases and fire, thus giving the family a few minutes to escape.
    Not everyone flees quickly from a burning home. Children often panic and hide in closets or under beds. Being prepared or knowing what to do in case fire breaks out can mean the difference between life and death. All members of the family should know certain basic steps.
    Everyone should know an escape route and second route from each room in the house. A family should determine a way in which any members can sound an alarm. And family members should be taught not to waste time getting dressed or collecting valuable possessions. Speed is necessary in escaping from fire.
33. What is the main cause of death during home fires?
34. What is the basic fire safety rule before people go to bed at night?
35. How do children often react in case of fire?