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Please write the first paragraph and the body part according to the following writing task. You are encouraged to develop the body part by illustration and/or cause and effect . Your essay can not be less than 160 words. (可不写末段) 可以直接写在作业本上拍照上传。 p.s.: 1. 主体段可以为1-2段; 2. 主体1段,建议例证法和因果法,分别论证一个分主题句;若主体2段,可每段分别用例证法和因果法中的一种。