词汇训练：.用适当的词填空（共10小题，每题1分，满分10分）
As everyone knows, the skin is ![]()
（必不可少的）to us. Our skins can sometimes![]()
(burn) due to our ![]()
(粗心). Therefore, first aid shows its importance in the![]()
（治疗） of burns. Generally speaking, burns, ![]()
are caused by hot liquids, fire, radiation and so on, can be divided into three types－first degree, second degree and third degree ![]()
(depend) on the ![]()
(受伤的) layers of the skin. To minor burns, cool water proves to be helpful in ![]()
（stop）the burning process and preventing or reducing pains. But ![]()
severe burns, get the ![]()
to the doctor immediately.
