根据以下教学案例,回答问题。 教学片段: 6B Unit 1学习的是比较级,其中有三个单词:fat(ter), strong(er), heavy(heavier)片段一:李老师在讲到fat这个词时,让学生来造句,有一位学生站起来,说了这样一句话: S1: Li Ming is fatter than me. T: Why? S1: He's heavier than me. 全班同学哄堂大笑,这位学生很难为情,但老师下面的一句话马上将气氛缓和了过来。 T: But I don't think he's too fat. He's strong. 片段二:张老师在教完这一课的内容后,组织学生寻找合作对象自编对话,一名学生站了起来想找一位较胖的学生来担任“比较对象”,有一位长得胖乎乎的学生自告奋勇站起来,于是发生了这样一段对话: S1: Who is fatter than me? S2: I am. I am fatter than him. T: Good! I think you are fatter. You are the right person. 当时全班同学哄堂大笑,这位学生一脸的尴尬,一个劲地挠脑袋。 问题: