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 【小题1】 （必不可少的）to us. Our skins can sometimes【小题2】 (burn) due to our 【小题3】 (粗心). Therefore, first aid shows its importance in the【小题4】（治疗） of burns. Generally speaking, burns, 【小题5】 are caused by hot liquids, fire, radiation and so on, can be divided into three types－first degree, second degree and third degree 【小题6】 (depend) on the 【小题7】 (受伤的) layers of the skin. To minor burns, cool water proves to be helpful in 【小题8】（stop）the burning process and preventing or reducing pains. But 【小题9】 severe burns, get the 【小题10】 to the doctor immediately.
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