书面表达。

     由于父亲常年在外工作，李华一边上学一边照顾多病的母亲。昨天李华不慎摔伤了脚，医生建

议他在家休息两周。请你根据以下提示，写一篇短文，谈谈如何帮助李华。（短文的开头已给出）

    提示：(1) Why will you help Li Hua? 

              (2) How can you help him with his lessons?

              (3) What are you going to do to help him with the housework?

    要求：(1)短文须包括所有提示内容，可适当发挥。 

               (2)文中不得出现真实的人名、校名和地名。

               (3)词数：60-80。

               Li Hua's father works in another city, so Li Hua has to take care of his sick mother after school. 

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氩弧焊是以什么作为保护气体的电弧焊？