汉浯提示：请写一篇150字左右的文章，说明发生火灾时如何逃生。
[写作导航]高楼大厦给火险逃生带来隐患，如何逃生值得探讨；其实事先防范很重要，这包括检查火灾紧急出口，弄清灭火器的位置及用法等；万一发生火灾也要冷静，可拨打火警电话、避免烟熏、不上电梯、悬挂标志求救等；只要有所准备，就能应对火灾。

[范文]
火灾逃生之法(how to survive in a fire accident)
    many people now rive and work in very tart buildings. it is often not so easy to get away from these buildings in an emergency, resulting in great toss of lives. so how to survive in case of a fire is a problem concerning all those involved.
    no one knows for sure when a fire witt happen, so it is extremely necessary to make preparations before a fire starts. check the fire escape in advance and make sure that you can find it in the dark when lights have failed. find out where the nearest fire extinguisher is and read the instructions to learn how to use it.
    don't lose your head if unfortunately a fire breaks out. first, telephone the fire department immediately when the fire just gets started. take care not to be overcome by smoke, which containing monoxide gas, can kill you quickly. cover your mouth with a wet towel or a wet cloth, and avoid getting into the smoke. don't get in an elevator, as you may get trapped if the electricity fails. if you can not get away by yourself, it is of great importance to hang something out of the window to attract attention as a sign of asking for help.
    in short, if you make preparations before hand and take precautions during the fire, chances are that you will survive in case of a fire if it really breaks out some day.