课前范文背诵  Hello, everyone! I'm glad to give you some knowledge about first aid when a fire breaks out.  First, it's important to keep calm and escape safely from the exit as soon as possible. At the same time do call 119 and tell them the exact address on the phone.   If you are trapped, be sure to close the door so that you can resist the intrusion（ [ntru()n] n.侵入;打搅） of heat and smoke. Never forget to stand in front of an open window and shout for help with a wet towel covering your mouth a ...