Unit5 Using language
1.You have three layers ________ skin which act ______ a barrier ________ disease，poisons and the sun’s harmful rays.
2.First aid is a very important first step ________ the treatment ________ burns.
3.You can get burned ________ a variety ________ things：hot liquids，steam，fire，radiation，the sun，electricity and chemicals.
4.Burns are called first，second，or third degree burns，depending ________ which layers ________ the skin are burned.
5.These burns are not serious and should feel better ________ a day ________ two.
6.Examples include mild sunburn and burns caused ________ touching a hot pan，stove or iron ________ a moment.
7.Remove clothing using scissors if necessary unless it is stuck ________ the burn.